In 1945, a German bomber crash-lands in Iceland during a blizzard. Puzzlingly, there are both German and American officers on board. One of the senior German officers claims that their best chance of survival is to try to walk to the nearest farm. He sets off, a briefcase handcuffed to his wrist, only to disappear into the white vastness…

Flash forward to the present. The U.S. Army is clandestinely trying to remove the wreck of an airplane from an Icelandic glacier. A young Icelander, Elías, inadvertently stumbles upon the excavation and then promptly disappears. But before he vanishes, he manages to contact his sister, Kristín. She embarks on a thrilling and perilous adventure, determined to discover the truth of her brother's fate―and solve the riddle of Operation Napoleon.