Ancient castle ruins, newly discovered on a tropical island, hundreds of years old! A local legend told the story of a mysterious castle, built on a remote island by a Spanish groom for his beloved Bride. The strange tale of an unexplained vanishing and the sinister doll holds a secret! Over the passing centuries, the newlyweds were forgotten, both had disappeared without a trace and the creeping rainforest had slowly reclaimed the castle site. History books, dusty and unread, held a reference to what once had been and a clue to the tragedy that unfolded so long ago and a decaying doll held the clues!Matt, Kate, Steven, Ben and Liz will solve the mystery to reveal the fate of doomed young lovers! School holidays spent on a tropical island was already an amazing adventure until the discovery of a ancient dagger wedged in the rocks at the beach! The children search for the castle ruins and discover the answer to the unsolved puzzle, a legend created hundreds of years ago!