Sam Graham loves solving mysteries. After successfully solving the mystery of Annabelle’s lost sock, Sam decides to make mystery-solving his main hobby (after tending the chickens, of course). He recruits his best friend Gavin and a couple of their classmates for a detective club, and together they’re ready for any mystery that comes their way. There’s a problem though...there are no cases to solve! So, Sam comes up with a plan: They’ll take the most interesting things in the lost and found and try to find out who lost what. But who could a locked box, a very long stuffed snake, and a red jacket belong to? And how will Sam and his friends find them? And...why does that jacket smell so bad?!?