Beginners Mystery Writing Prompts

Write a scene where a superhero must reveal their true identity to someone they care for.

The house at the end of the street has been boarded up for as long as your protagonist can remember. Today, they decide to explore.

Write a letter to a friend, from the perspective of someone living 100 years in the future.

What commonplace things might they mention that would surprise a reader now, and how can you use these to drive an interesting narrative?