
Every mystery has a crime and the crime could be anything. Except the crime usually has a motive. So this picture shows that a crime has happened and that is why they put the tape to prevent people from going there.
Every crime also has an investigator or detective who solves the crime so this picture shows a detective with his magnifying glass ready to solve a crime.
ALL mysteries have villains or as some people call them bad guys. They are always there to start up the crime and do something wrong. Something illegal of course. That's why I picked this picture because he looks like a classic villain.
Every crime has evidence and in the case of this crime the evidence is a knife. The knife is a classic murder weapon because many murders include stabbing with some sort of knife.
Every mystery also has clues. Clues are the things that lead the investigator closer towards figuring out the crime. Sometimes the clues bring suspense to the audience for example the picture of footprints on the floor and they're marked there with blood.
Every crime always has a red herring. A red herring is something that throws an investigator the wrong way or further from solving the crime.