road the murderer would probably travel to and from his evil deeds. Matthäi purchased a gas station along the route and then hired a housekeeper with a daughter named Annemarie, who matched the profile of the murdered girls. With Annemarie in place, living along the road as bait for the killer, Matthäi waited for the villain to come to him. Matthäi's plan seemed to come to fruition, as one day the girl reported having encountered a man matching the profile Matthäi had constructed of the killer. She even included details that tied the man's behavior to that of a man the original murdered girl had reported seeing prior to her death. Matthäi planned to apprehend the killer the next day, having convinced the skeptical police to indulge him and surround the area where Annemarie said she was to meet the man again. They had lain in wait for him, but no one ever arrived. The failure proved to be utterly devastating for Matthäi. The police and all other outsiders were finally convinced that no other killer existed and that Matthäi's quest had been borne solely of his own madness. His relationship with Annemarie and her mother was destroyed through their discovery that despite the genuine love they had developed for him, he had seen Annemarie merely as bait for his trap. Unable to fathom how his intricate and detailed detective work had not resulted in a triumphant resolution to the case, Matthäi sank finally into insanity and alcoholism. Only years later, far too late to be of any use to Matthäi, was the truth revealed that his instincts and detective work actually had been entirely correct. The murderer had not arrived for his meeting with Annemarie on the fateful day simply because he had been killed in a car accident while on his way to the rendezvous. Es geschah am hellichten Tag In the original film Es geschah am hellichten Tag, the story was directly that of the Matthäi character, rather than being framed through its retelling by Dr. H., as in Das Versprechen. At the end of the movie, Matthäi demonstrates his concern for Annemarie by sending her and her mother away to safety before attempting to spring his final trap upon the murderer. The murderer arrives and is killed, thus vindicating Matthäi's persistence in pursuing the case and leading to a happy reunion with Annemarie at the story's