A Global Thriller Award–winning novel: "Fast-paced, good old-fashioned Cold War espionage set underwater in 2099, this book offers a great escape!" (The Minerva Reader).

Living underwater is inherently dangerous. At any moment, a trickle of water from the bulkheads could mean immanent death. But Truman "Mac" McClusky is used to danger. He's been out of the intelligence business for years, working the kelp farms and helping his city Trieste flourish on the shallow continental shelf just off the coast of Florida.

Then his former partner shows up, steals a piece of valuable new technology and makes a mad dash into the Atlantic. Before he knows it, Mac is back in the game, chasing the spy to retrieve the tech—and teach his former friend a lesson he won't forget.

But when Mac learns the grim truth behind the theft, it plunges him into an even deadlier mission. With lethal secrets in his pocket, he needs to evade the submarines of hostile foreign powers, escape assassins, and forge through the world's oceans at breakneck pace on a daring quest to save his city and stay alive.