Nate the Great

Annie asks Nate to find her missing picture. He gathers facts, asks questions, and narrows the suspects, letting the investigation proceed through an explicit chain of reasoning rather than a lucky discovery.

That makes this a useful first mystery for a child who wants to participate in the solution. The lost object is concrete, the client is personally connected to Nate, and the method shows that noticing and eliminating possibilities are central detective skills. Timmy Failure asks readers to see past an unreliable detective; Nate the Great directly models a competent sequence of questions and elimination.