Blake Harper only wants to run her business and focus on her love life. But while she's setting up for Mystery Cup Café's big Halloween bash, she sees a clown stab a masked man in the chest.

Blake calls her sister, the town's lead detective, but when the police arrive, there is no killer... and no body. While everyone blows the whole thing off as a prank, Blake knows the truth. When the clown later makes an appearance at the party, she realizes the killer may be out to eliminate any witnesses.

Blake must figure out not only who the killer is, but also who the victim was. Will she be able to solve the murder when she's faced with a town full of people who don't even believe a crime happened? And can she unmask the killer before he stops her once and for all?