In Perry’s 18th Victorian mystery in her popular William Monk series (after Acceptable Loss, 2011), Thames River Police Commander William Monk investigates the violent death of Zenia Gadney, whose body was found mutilated on London's Limehouse Pier. Gadney’s waterfront neighbors tell him of a gentleman caller who visited Zenia every month for 15 years. Was she a prostitute? And what secrets could she have been hiding? Joined by Monk’s wife Hester and barrister Sir Oliver Rathbone, Perry has written a surprising whodunit with a cold-blooded killer, and opium cover-up, and a riveting courtroom drama.