A stand-up comedian wonders who she can trust when she anonymously receives the same token clue, a small white book, that has been found at each scene of a serial murder case.

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. Detectives have failed to catch Billy, or figure out what the white books symbolize and why the killer leaves them behind. 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? Kim has no friends and trusts no one, so why would Billy Dead Mates want to target her? -- adapted from jacket