With all the ghostly adventures Joey DeAngelo has had since moving to Boston, he felt it was time to take his new friend Tank to one of the most haunted places on Earth—Star Island. Star Island is one of the islands in the Isles of Shoals off the coast of Portsmouth, New Hampshire. Most of these nine tiny isles are rich with ghostly legends, but Joey is really after Blackbeard's buried treasure! With some help from a strange local girl, Joey and Tank enter one of the many caves of Star Island and find something hidden in them. Will the boys come away from the caves with riches or more ghost stories to tell?