OPINION
Relators are accountants who have been sued for professional malpractice based on their advice concerning a failed tax shelter. To further their discovery, they petition us for a writ of mandamus compelling the trial judge to allow them to depose an attorney-witness. The prospective witness, a tax specialist, had previously counseled with the plaintiff/real party-in-interest about the same tax shelter. Relators assert that the attorney’s prior advice is critical to their defense and they are entitled to it; plaintiffs assert that the attorney-client privilege protects the advice from disclosure. In the court below, the Honorable Geraldine Tennant ruled that the attorney-client privilege prevailed and denied rela-tors’ motion to compel the deposition. We find that the trial court abused her discretion and conditionally grant the writ to allow the deposition.
Real parties-in-interest, Dr. Mahdi Al-Bassam and Gary H. Knostman, bankruptcy trustee for Dr. Al-Bassam’s Chapter 7 bankruptcy case, filed a lawsuit in 1987 against relators, Alan D. Westheimer, Panned Kerr Forster and Westheimer & Company, P.C., alleging professional accounting malpractice in providing investment advice about an “Art Master” tax shelter (Art Master). After Dr. Al-Bassam invested money in this tax shelter, the Internal Revenue Service ruled that the Art Master was a fraudulent investment and assessed a tax liability against him. Relators filed a general denial and plea in abatement.
During the discovery phase of the lawsuit, relators’ research led them to believe that Ruben Leonard Weiner, an attorney and certified public accountant, had advised Dr. Al-Bassam to invest in Art Master before Dr. Al-Bassam established a professional relationship with relators. Relators filed a notice to take Leonard Weiner’s oral deposition and attached a subpoena duces tecum for production of, among other things, a December 1, 1981, invoice sent to Dr. Al-Bassam by Weiner. They also requested any documents, letters, or notes taken at any meeting which included Dr. Al-Bassam and concerned the Art Master program, or other tax-oriented investments. On the scheduled deposition day, the real parties-in-interest filed a motion for protective order stating that the attorney-client privilege precluded the disclosure of the requested information from Mr. Weiner. During the deposition, Mr. Weiner produced the invoice dated December 1, 1981, in the amount of $400 which had been sent to Dr. Al-Bassam along with a copy of a canceled check in that amount, reflecting Dr. Al-Bassam’s payment to Mr. Weiner. This invoice stated:
Phone consult with Norman Ross. Skimmed the books prepared by Mr. Shu-man describing the details of the art deal and the mining deal at our office and briefly reviewed recent developments in the law relating to certain tax aspects affecting each of them. Later, met with Dr. and Mrs. Al-Bassam, Norman Ross and Samuel Shuman at your office discussing the tax aspects of those two investments.
$400.00
*Payment of this invoice is deductible.
Mr. Weiner identified Norman Ross as an insurance agent who called himself a financial planner and Mr. Shuman as a tax shelters promoter whom he consulted before the meeting specified in the December 1, 1981, invoice. Mr. Weiner stated he did not send any invoices to Mr. Ross or Mr. Shu-man. After counsel for Dr. Al-Bassam asserted the attorney-client privilege on his behalf, Mr. Weiner refused to answer any other questions relating to Art Master. *882 Relators announced the deposition was concluded pending the trial court’s decision on the motion for protective order.
At this time, counsel for real parties-in-interest proceeded to question Mr. Weiner about the meeting mentioned in the invoice. Mr. Weiner in response stated he was unsure of the meeting’s exact date and could not find the file, but he “vividly” remembered the meeting as a “very unique experience.” Although he knew other people involved in art tax shelters promoted by Sam Shuman, he was not sure if they specifically invested in Art Master. Mr. Weiner also stated Dr. Al-Bassam had retained him within a week of the meeting. He also indicated that relator, Mr. Westheimer, informed him that Dr. Al-Bassam retained relators sometime after that meeting or “it might have even been the next year.” When asked if he rendered services to Dr. Al-Bassam as an attorney, he responded that he gave “advice.”
Relators filed a motion to compel Mr. Weiner in deposition on the grounds that his testimony was essential to their defense, because Dr. Al-Bassam consulted and obtained advice about Art Master from him at least 6 years prior to the filing of the lawsuit. Real parties-in-interest responded by again asserting the attorney-client privilege. After a hearing, respondent signed an order denying relators’ motion to compel. Relators contend mandamus should properly issue because respondent’s denial of their motion was an abuse of discretion, in that it allowed the real parties-in-interest to use the attorney-client privilege to offensively shield from discovery material information. They contend it also deprived them of the opportunity to preserve Mr. Weiner’s testimony for appellate review. For the reasons hereinafter set out, we conditionally grant the writ.
To issue writs of mandamus, we are guided by specific and narrow standards. We may issue all writs of mandamus which are agreeable to the principles of law regulating those writs. Tex.Gov’t Code Ann. § 22.221(b) (Vernon 1988). Mandamus issues only to correct trial court actions where there has been a clear abuse of discretion or the violation of a duty imposed by law when there is no other adequate remedy by law.
Johnson v. Fourth Court of Appeals,
[Rjeview of a trial court’s determination of the legal principles controlling its ruling is much less deferential. A trial court has no “discretion” in determining what the law is or applying the law to the facts ... and may result in appellate reversal by extraordinary writ.
Id. An appeal would not be an adequate remedy where the party’s ability to present a viable claim or defense at trial is vitiated or severely compromised by the trial court’s discovery error. Id. at 475. The remedy by appeal may be inadequate where the trial court disallows discovery and the missing discovery cannot be made part of the appellate record. Id.
Relators allege the trial court abused its discretion in permitting real parties-in-interest to assert the attorney-client privilege during the deposition because the underlying malpractice suit is based on alleged prior advice by Mr. Weiner concerning the Art Master investment. Relators argue that the real parties-in-interest waived this privilege by filing suit, and thus placing all other sources of advice relating to Art Master in issue. We agree.
Rule 166b (1) of the Texas Rules of Civil Procedure provides that permissible forms of discovery include depositions, interrogatories and requests for production. Tex. R.Civ.P. 166b (1). Rule 166b (3)(e) exempts any matter protected from disclosure by privilege. Tex.R.Civ.P. 166b (3)(e). The lawyer-client privilege provides:
*883 A client has a privilege to refuse to disclose and to prevent any other person from disclosing confidential communications made for the purpose of facilitating the rendition of professional legal services to the client (1) between himself ... and his lawyer ...
Tex.R.Civ.Evid. 503(b). A communication is “confidential” if not intended to be disclosed to third persons other than those to whom disclosure is made in furtherance of the rendition of professional legal services to the client or those reasonably necessary for the transmission of the communication. Tex.R.Civ.Evid. 503(a)(5). If a trial court determines that an in camera inspection and review by the court of some or all of the requested discovery is necessary, the objecting party must segregate and produce the discovery. Tex.R.Civ.P. 166b (4).
Relators rely on
Ginsberg v. Fifth Court of Appeals,
A plaintiff cannot use one hand to seek affirmative relief in court and with the other lower an iron curtain of silence against otherwise pertinent and proper questions which may have a bearing upon his right to maintain his action.
Id.
at 108 (quoting
Pavlinko v. Yale-New Haven Hospital,
The
Ginsberg
reasoning has further been extended to the attorney-client privilege in
DeWitt and Rearick, Inc. v. Ferguson,
Real parties-in-interest maintain that the relevancy of Mr. Weiner’s testimony about Art Master does not automatically outweigh the interest in preserving the attorney-client privilege, relying on
Cantrell v. Johnson,
We now address the facts and circumstances of the instant case to determine whether real parties-in-interest have attempted to withhold essential and relevant information necessary to relators’ defense against the underlying lawsuit. Real parties-in-interest initiated an accounting malpractice lawsuit against relators for “representation made, advice given and facts concealed in connection with the purchase of goods and services which were supposed to constitute a tax shelter investment.” Mr. Weiner testified he was employed by and gave advice to Dr. Al-Bassam. He produced an invoice indicating he discussed the tax aspects of the Art Master investment at a meeting with Dr. and Mrs. Al-Bassam, Norman Ross and Samuel Shuman. Since Mr. Weiner apparently advised Dr. Al-Bas-sam about the same investment that forms the basis of this lawsuit, we believe the real parties-in-interest have offensively asserted the attorney-client privilege to shield relevant facts by adversely thwarting rela-tors from discovery that could seriously impact the merits of their lawsuit. Even the court in Cantrell stated its case was “not a situation in which proof of defenses might be entirely precluded if the discovery in question is not permitted.” Cantrell at 189. That is not the case here. Relators would be deprived of their right to discover pertinent and perhaps favorable evidence if we allow the real parties-in-interest to seek legal relief against them in our courts, but draw a legal curtain around otherwise proper evidence which may bear on the merits of the lawsuit. As important as the attorney-client privilege is, it cannot be used to subvert the advocacy system that spawned it. Prior advice received by Dr. Al-Bassam on the very matter asserted in his lawsuit cannot be shielded from discovery. Our rules of civil procedure, and the federal rules upon which they are based, mandate a flexible approach to discovery. Walker at 471. A party may seek any information which “appears reasonably calculated to lead to the discovery of admissible evidence.” Tex.R.Civ.P. 166b(2)(a). Unlike Cantrell, real parties-in-interest here neither requested a hearing on the attorney-client privilege nor produced any documents for in camera inspection.
Our holding in this matter in no way precludes an in camera inspection by respondent of any records that may be available to weed out non-relevant matters. Nor do we preclude respondent from any other protective order to insure that the deposition is confined to testimony relevant to attorney Weiner’s advice to Dr. Al-Bas-sam concerning the Art Master tax shelter.
Accordingly, we conditionally grant the petition for writ of mandamus. We direct the trial court to vacate her order and to grant the motion to compel Mr. Weiner to answer relators’ deposition questions and produce the information requested by them. We presume respondent will comply with the terms of this judgment. Mandamus will issue only should she fail to do so.
