Houston divorce lawyer Marcia Zimmerman recently defeated a former client’s legal-malpractice suit against her and her firm, winning a breach of contract verdict against him in the process. But the experience presents a cautionary tale for other lawyers about clients you think you know and the unexpectedness of a malpractice claim, Zimmerman says.

The suit she won represents the first time she ever had a malpractice claim filed against her in 30 years of practicing, and it arose not during her first time representing the plaintiff, her former client Eugene McMahon, in a divorce, but during a second time.