On a sunny afternoon in late June, Cambridge professor Joseph Reavley is summoned from a student cricket match to learn that his parents have died in an automobile crash. Joseph’s brother, Matthew, as officer in the Intelligence Service, reveals that their father had been en route to London to turn over to him a mysterious secret document—allegedly with the power to disgrace England forever and destroy the civilized world. A paper so damning that Joseph and Matthew dared mention it only to their restless younger sister. Now it has vanished.

His name, they tell him, is William Monk, and he is a London police detective. But the accident that felled him has left him with only half a life; his memory and his entire past have vanished. As he tries to hide the truth, Monk returns to work and is assigned to investigate the brutal murder of a Crimean War hero and man about town. Which makes Monk’s efforts doubly difficult, since he’s forgotten his professional skills along with everything else.

The year is 1861. The American Civil War has just begun, and London arms dealer Daniel Alberton is becoming a very wealthy man. His quiet dinner party seems remote indeed from the passions rending America. Yet investigator William Monk and his bride, Hester, sense growing tensions and barely concealed violence.

Throughout the annals of fiction, there have been many celebrated detective teams: Sherlock Holmes and John Watson. Nick and Nora Charles. Hercule Poirot and Arthur Hastings. Thomas and Charlotte Pitt. That last pair is the creation of beloved mystery writer Anne Perry, who, as the editor of Odd Partners and in conjunction with Mystery Writers of America, has enlisted some of today’s best mystery writers to craft all-new stories about unlikely duos who join forces - sometimes unwillingly - to solve beguiling whodunits.

On vacation from London on the beautiful Italian coast, 28-year-old Elena Standish and her older sister Margot have finally been able to forget some of the lasting trauma of the Great War. Touring with her camera in hand, Elena has found new inspiration in the striking Italian landscape, and she's met an equally striking man named Ian. Not ready to part from one another, she and Ian share a train trip home to England. But a shocking murder disrupts their agenda, forcing Elena to personally deliver a message to Berlin that could change the fate of Europe.