The white-knuckled saga of the US Navy task force that captured Nazi submarine U-505 and the Enigma machine.

Two days before D-Day—the course of World War II was forever changed. The German hunters of the Atlantic Ocean had become the hunted, and US antisubmarine Task Group 22.3 seized a Nazi U-boat, its crew, and all its secrets. Led by a courageous nine-man boarding party and maverick Captain Daniel Gallery, Operation Nemo was the first seizure of an intact enemy warship in battle since the War of 1812, and the intelligence gathered from it dramatically shortened the duration of the war. But at any moment, the mission could have ended in disaster.

Charles Lachman’s Codename Nemo traces every step of this historic pursuit on the deadly seas, documenting the thrilling cat-and-mouse game through the eyes of the men on both sides. The result is a deeply researched, fast-paced World War II narrative for the ages.