Bad Brains (2006)

Davide and his fiancée Alice aren't two simple serial killers. They are looking for something inside the bodies of their victims, which forms the mystery of the story. And thy will continue to kill people until they find what they are looking for. Their crazy love story and strange research go on, but something changes when they meet a weird man named Mirco. This guy seems to know many things about Alice and Davide's past, and it seems that he isn't scared of them.