Olympic rowing hopeful and senior Metropolitan Police officer DCI Rebecca Meredith goes out alone to train on the river in Henley on a dark afternoon in late October - and doesn't return. When a desperate search by the police and a K9 team reveals the possibility of foul play, Scotland Yard wants one of their own on the case.
Detective Superintendent Duncan Kincaid, returning from celebrating his marriage to long-time partner Detective Inspector Gemma James, is called to Henley to investigate. He soon finds that the world of elite rowing can be brutal, and that Rebecca Meredith's ex-husband was not the only person with good reason for wanting her dead. Then, when a search-and-rescue team member is threatened, Kincaid realizes the case may be even more complex and more dangerous than he believed.