When farm boy Homer Pudding's explorer-uncle dies and leaves him a droopy dog with a mysterious coin hidden on its collar, it leads him to The City, where they meet Madame La Directeur, the conniving head of the Natural History Museum, who is trying to steal the coin and take Homer's place in a secret society of adventurers.

"Homer thought membership in L.O.S.T., the mysterious Society of Legends, Objects, Secrets, and Treasures, would help him find pirate Rumpold Smeller's missing treasure. But when Homer's enemy, Lorelei, forms an evil organization called FOUND, Homer and Dog face an impossible decision: Work with Lorelei to find the prize once and for all, or abandon their lifelong quest to locate the treasure"--Provided by publisher.