A psychopath the police have dubbed “Billy Dead Mates” is targeting pairs of best friends, and killing them one by one. Before they die, each victim is given a small white book. For months, detectives have failed to catch Billy, or figure out what the white books symbolize and why the killer leaves them behind. Then a woman, scared by what she’s seen on the news, comes forward. What she reveals shocks the investigators and adds another troubling layer to an already complex case. Stand-up comedian Kim Tribbeck has one of Billy’s peculiar little books. A stranger gave it to her at a gig she did last year. Was the stranger Billy, and is he targeting her --- or is it something more nefarious?