The face of a stranger: His name, they tell him, is William Monk, and he is a London police detective. With his memory erased after a terrible accident, Monk intends on hiding his condition and starting a new life by tackling a grisly murder case in which each new revelation leads him to the answers he seeks—but dreads to find.

A dangerous mourning: Called upon to investigate the brutal murder of a blue-blooded young widow, Monk is plagued by both his lingering amnesia and an inept supervisor. But when nurse Hester Latterly offers her assistance, together they grope warily through the silence and shadows that obscure the aristocrat's demise.

Defend and betray: After a brilliant military career, General Thaddeus Carlyon meets his death not on the battlefield but at a London dinner party. Although his wife confesses to the murder, Monk and Hester suspect deceit. With the trial only days away, they feverishly work to unravel the dark heart of the mystery.