Mystery Tales is a collection of five different tales. In the first tale, The Case of the Missing Skateboard, two friends investigate the theft of a skateboard and discover a surprising twist involving one of their brothers. In The Secret Garden of Lila, two friends explore a hidden garden and discover a talking caterpillar who enlists their help to protect the garden from an evil witch. The third tale, Harper and Atlas and the Missing Robot, follows two friends as they search for their stolen robot and discover a surprise culprit. In The Curious Case of Lila's Lost Voice, Lila goes on a quest to find her lost voice and learns valuable lessons about communication and empathy. The final tale, The Mystery of the Haunted House, follows two friends as they investigate a spooky abandoned house and discover a surprising truth about its former owners.