Spain, July 1937. Among Franco's volunteers in the Spanish Civil War is Martin Bora, German officer and detective in the Spanish Foreign Legion. Doubts about his mission in Spain arise when Bora happens upon the body of poet Federico Garcia Lorca. Who murdered him? Why? Bora begins a perilous investigation, which paradoxically proceeds alongside that of Walton, his opposite number with the International Brigades. Soon they join forces, culminating in a thrilling chase after a murderer, and an existential face-to-face between two adversaries forever changed by their encounter.