Operation Napoleon by Arnaldur Indridason

Prepare for blockbuster action in the vein of Clive Cussler and Alistair Maclean
A mesmerizing international thriller that sweeps from modern Iceland to Nazi Germany. In 1945, a German bomber crash-lands in Iceland durign 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, Elias, inadvertently stumbles upon the excavation and then promptly disappears. Before he vanishes, though, he manages to contact his sister, Kristin. She embarks on a thrilling and perilous adventure, determined to discover the truth of her brother's fate. Kristin must solve the riddle of Operation Napoleon, even if it means losing her own life.
Arnaldur Indridason has proven himself to be a master of the mystery genre with his critically acclaimed Inspector Erlunder series, which has sold more than 6 million copies. Now, world-class writing and nonstop action meet in this spellbinding page-turner, which catapults Arnaldur Indridason to the top ranks of international thriller writers.