A "murder mystery" is a type of story or event where there is a crime, usually a murder, that needs to be solved. It involves clues and investigation to figure out who committed the crime. Full definition
Simply put, it is a little difficult to convince anyone who doesn't speak Danish to sit through a twenty episode murder mystery in a foreign language. (oracleoffilm.com)
It's a kind of murder mystery event whereby one of them gets «kidnapped» and the others have to set out to find the hostage. (contactmusic.com)
Note: It's important to distinguish murder mystery parties from regular dinner parties, lest you become a shut - in with no human interaction. (policygenius.com)