"A wartime mystery to sink your teeth into."--Kate Quinn, New York Times bestselling author of The Huntress

Maggie Hope started out as Winston Churchill's secretary, but now she's a secret agent--and the only one who can figure out how the missing violin ties into a series of horrifying murders.

London, December 1943. As the Russian army repels German forces from Stalingrad, Maggie Hope takes a much-needed break from spying to defuse bombs in London. But Maggie herself is an explosion waiting to happen. Traumatized by her past, she finds herself living dangerously--taking huge risks, smoking, drinking, and speeding through the city streets on a motorbike. The last thing she wants is to get entangled in another crime.

But when she's called upon to look into the theft of a Stradivarius, one of the finest violins ever made, Maggie can't resist. Meanwhile, there's a serial killer on the loose in London, targeting conscientious objectors. Little does Maggie know that investigating this dangerous predator will pit her against a new evil--and old enemies. Only Maggie can uncover the connection between the robbery, the murders, and a link to her own past.