Shot down over German-occupied Yugoslavia in 1944, American lieutenant Bill Bogdonavich dreams of the impossible: escape. With three failed missions behind him, Lieutenant Drew Carlton nonetheless volunteers for Operation Halyard, a secretive assignment bringing together American special operations officers and guerilla fighters in Yugoslavia's green hills. Based on a true story, Tom Young's thriller follows the men who executed this daring plan—evacuating hundreds of stranded airmen while avoiding detection by the Germans—in the face of overwhelming odds.