At nearly 100 years old, Thalia Mars is a far cry from the patients Alex Delaware normally treats. But the charming, witty woman convinces Alex to meet with her in a suite at the Aventura. What Thalia wants from Alex are answers to unsettling questions about guilt and patterns of criminal behavior. When Alex asks the reason for her morbid fascination, Thalia promises to tell all during their next session. But when he shows up the following morning, Thalia is dead in her room. When questions arise about how Thalia perished, Alex and homicide detective Milo Sturgis must peel back the layers of a fascinating but elusive woman’s life and embark on one of the most baffling investigations either of them has ever experienced.