When Trip and his best friend, Sam, find a mysterious silver coin in the weed-infested grounds of an old, abandoned South Carolina plantation, they are fascinated by the strange symbols and words engraved on its surface. Where did it come from? How did it get there? What does it mean? Soon after they recruit their friend, Emily, to help them answer those questions, the three friends are thrust into a series of adventures that takes them back in time. A magic well, pirates, hidden treasure, a gigantic talking hawk and survival on a remote island in the South Carolina Lowcountry are just a few of the things they face as they try to solve the Mystery of the 13th coin."--Front flap of jacket.