The body had been drained of blood... In a remote area of the Transylvanian Alps, an U.N.C.L.E. agent had been killed in mysterious circumstances. The man's footprints in the snow led up to the base of the tree where he had been killed, but here were no pursuing tracks, no clues at all as to what doom had overtaken him. There were only the two small holes in the neck, and a complete absence of blood. Napoleon Solo and Ilya Kuryakin didn't believe in vampires - but as they investigated their fellow-agent's death they were forced again and again to wonder if perhaps the old terrors of the region had more reality than the world would like to think...