1942. From London, the leaders of the Free French Forces receive intelligence suggesting that Nazi Germany has developed a revolutionary new type of submarine. An ultra-secret mission is launched: four men are tasked with infiltrating the most heavily guarded naval base in Europe and stealing the mysterious U-boat.

There’s just one catch—none of the four operatives fits the profile of the ideal war hero. As they venture deep behind enemy lines, they discover, at great personal risk, that the mission is far more dangerous than they were led to believe. Because the target they’ve been sent to steal isn’t a submarine at all.