Chase by Dean Koontz  (English)

Ben Chase is a war hero, but a reluctant one. He struggles with bitter memories and feels alienated from the culture to which he has returned. When he claims that a psychopath is stalking him, he has by then made such an outsider of himself that no one believes him. He must resurrect the repressed warrior within to save himself and a woman he comes to love. Heroes need monsters to slay, and they can always find them - within if not without.