Book excerpt: Barbara is a physician and pianist. Margo is a brilliant mathematician and cellist. Lucia is a philosopher, nun, and violinist. These amateur but talented and accomplished musicians have met to celebrate the silver jubilee of their Vows. This year the plan was to play, in its entirety, the music that brought them together and made them sisters in heart and mind for life: Tchaikovsky's Trio in A minor for Violin, Cello, and Piano; and they played it as never before! Barbara and Margo had never heard Lucia play as she did this time. Her violin sang with perfect intonation, controlled breathing, and redeeming passion, but after the performance, Lucia confesses to being found in a situation unbecoming to a nun. She is pregnant! Though she denies having been with a man, the facts confirm that her vows as a nun were violated and that she may have lied. Bound by the promise of trust, faith, and truth the three shared, Barbara and Margo had believed Lucia. Now they must ask themselves if their faith was unwarranted. Or could Lucia be telling the truth?