A thriller is a type of mystery with a few key differences. As its name suggests, thrillers tend to be action-packed and fast-paced with moments full of tension, anxiety, and fear. Without fail, they are plot-driven stories. Whereas a good mystery may provide a deep dive into the clues that lead a detective to solve a crime, thrillers give you just enough information to provide a convincing motive for the characters to get back to the action. All thrillers are mysteries — readers want to know how the world will be saved or how to escape a serial killer — but not all mysteries are thrillers.