From the New York Times bestselling author of Matterhorn comes a heart-stopping thriller about a man who returns to a life of espionage to save the woman he loves and the City of Light.Retired special agent Mac Dekker travels to Paris to propose to Ava Attal, once Mossad's deadliest operative. After too long, life is good. But before he can propose, Ava leaves the table to take an urgent call. And never returns.Mac launches a frantic search, spiraling through the city's brightest and darkest places. People are lying, agents are dying, and he finds himself caught in the crosshairs of CIA shadows and enigmatic assassins while battling a wealthy, ruthless prince planning a truly terrifying act of violence. With only hours to find Ava and save thousands of lives, Mac's CIA training kicks in, along with his instincts: Is Ava truly missing, or did she come to Paris on a mission even more secretive than his own?