Fiction · Thriller · Crime · Suspense · Cozy Mystery · Detective · Murder Mystery · Historical Mystery · Noir · Whodunit · Paranormal Mystery ...Mystery fiction is a loosely-defined term that is often used as a synonym of detective fiction — in other words a novel or short story in which a detective (either professional or amateur) solves a crime. The term "mystery fiction" may sometimes be limited to the subset of detective stories in which the emphasis is on the puzzle element and its logical solution (cf. whodunit), as a contrast to hardboiled detective stories which focus on action and gritty realism.