Homer thought that being inducted as a member of the treasure hunting society L.O.S.T. would be the key to finding pirate Rumpold Smeller's missing fortune. But when Homer's sworn 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.

In the end, there can be only one owner of the coveted pirate booty. Who will reach it first? And who will be forced to walk the plank? What does FOUND mean for the future of L.O.S.T.? And just what is this famous treasure, anyway? Adventure abounds in this fun-filled, seaworthy tale of friendship, mystery, and one very special four-legged friend.