Features characters who are not professional detectives but get involved in solving mysteries due to personal interest or circumstance.

Light-hearted mystery that is easy to read, witty and not too intense.  Can also be more comic in nature.  Examples: Clue, Scooby Doo, Hardy Boys, or Janet Evanovitch books

Often involves a murder in a closed setting like a village or a manor, with the crime solved by an amateur or professional detective by the story's end.

also referred to as "cozies", are a sub-genre of crime fiction in which sex and violence occur off stage, the detective is an amateur sleuth, and the crime and detection take place in a small, socially intimate community.  This is also a sub-genre with strong tropes that define it

stories where the protagonist is a sleuth of some sort, ranging from nosy neighbor to retired detective that is puzzling out the details of why a crime was committed and who did it. More intense than a cozy, more serious than a caper, but not as hard core has hard boiled/noir.   Example: Agatha Christie books

The historical mystery or historical whodunit is a sub-genre of two genres, historical fiction and mystery fiction. Raiders of the Lost Ark

Contains light mystery elements such as crimes to solve, but solving a crime is not the focus of the story.

A sub-genre where the crime, usually a murder, happens in circumstances where it seems impossible for the perpetrator to have entered or left the scene.

(Strong Trope Alert) in noir the protagonist isn't a detective, but a victim, a suspect, and/or a perpetrator of crime. Hard-Boiled is a literary genre that shares some of its characters and settings with crime fiction (especially detective fiction and noir fiction). The genre's typical protagonist is a detective who battles the violence of organized crime that flourished during Prohibition (1920–1933) and its aftermath, while dealing with a legal system that has become as corrupt as the organized crime itself. Detectives of hardboiled fiction are often antiheroes. Notable hardboiled detectives include Philip Marlowe, Mike Hammer, Sam Spade, Lew Archer, Slam Bradley, and The Continental Op.

is a subgenre of procedural drama and detective fiction that emphasizes the investigative procedure of a police officer or department as the protagonist(s), as contrasted with other genres that focus on either a private detective, an amateur investigator or the characters who are the targets of investigation

 Delves into the mind, exploring themes of sanity, identity, and often includes elements of suspense or thriller.