Heroine Zoe Hayes, a divorced art therapist with a six-year-old adopted daughter, returns with another gripping tale set in Philadelphia, this time taking place on the famous Boathouse Row.

On summer vacation from her job, Zoe takes a sculling class with her best friend, Susan. One evening, while her daughter waits with Susan's children at the boathouse on the banks of the Schuylkill River, the two mothers row off to practice for an upcoming regatta. But when their boat capsizes, Zoe and Susan find themselves flailing about amongst a throng of floating corpses. Someone along Boathouse Row is a murderer. But who?