British spy Emma Makepeace goes undercover on a Russian oligarch's superyacht, where she's one wrong move away from a watery grave, in this electrifying thriller from the author of Alias Emma.

"Delivers everything fans of spy fiction could want: an absorbing plot, shadowy characters, page-gripping tension."--The Washington Post (Best Books of the Year)

An MI6 operative is found dead, locked in a suitcase inside his own apartment. Despite an exhaustive search, no fingerprints are found at the scene. Emma Makepeace and her handler, Ripley, know an assassination when they see one, and such an obvious murder can mean only one thing: Someone is sending a message.

As she digs into his past, Emma discovers that the unfortunate spy had been investigating two Russian oligarchs based in London. He'd become obsessed with the idea that the two were spies, aided by a third man--whose identity he had yet to uncover. When he shared his findings within MI6 in the weeks before he died, the response came back fast and clear: Drop the investigation and move on. Had he uncovered a secret that cost him his life?

To pick up where he left off without ending up in a suitcase of her own, Emma goes undercover on one of the oligarch's million-dollar yachts, scheduled to set sail from the Côte d'Azur to Monaco. Under other circumstances, this would be a dream vacation. But if Emma's real identity gets discovered, it's a death sentence.

As Emma's work reveals secrets she'd be safer not knowing, the danger ratchets up. The killer may be closer to home than any of them imagined, and Emma won't be safe until he--or she--is caught.