One is the show Law and Order. In the first half of the show a crime is committed, two police detectives investigate the crime, and arrest a suspect. In the second half, you see the trial of the suspect. A suspect on the show maybe guilty and get away with it or may even be innocent and help catch the real criminal. The two reasons the show is so popular is that the mysteries are complex and the mysteries are used as platforms for larger issues like abortion and AIDS, issues that most people have an opinion on.
Many movies are mysteries.
One I enjoy is the movie I Love Trouble . It is about two rival Chicago reporters who discover that a train derailment is just part of a deadly conspiracy to conceal the fact that a genetics company is planning to market a product the company knows is unsafe. The two reporters at first try to sabotage each other s efforts but soon realize that they would work better as a team, in spite of the fact that they cannot stand each other. Although, the movie has a romantic element, it is indeed a mystery. The story has clues and focuses on the two reporters investigations into the train derailment.