The mystery genre shares a lot of similarities with the thriller genre. The two genres basically focus on the same type of content or stories, and that is unraveling mysteries and unanswered questions. The major difference between the two genres is the style adopted in telling the story.
For mystery content, the protagonist is usually a detective or a law enforcement agent. Moreso, this genre uses less action, tension, or violence. It features more logic, fact-finding, and suspense than adrenaline-pumping excitement. Lastly, the crime or puzzle involved in this genre is usually not big or on large scale like that of the Thriller genre.