Mr. Wolf's students are settling into their new classroom, and Randy, Aziza, and Margot realize they have some questions:

1. What happened to Aziza's favorite Frisbee?
2. Is the girls' bathroom really haunted?
3. Where is Mr. Greens, the teacher who disappeared?

To answer these questions, the three friends start a mystery club! What could be more fun? Meanwhile, Abdi is wondering what happens to the balls that are accidentally kicked over the fence during recess, and thinks he'll be a hero if he can find his best friend's football.

Mysteries abound at Hazelwood Elementary!