Best friends Tat and Hetty are thrilled to read in the Little Snoring Gazette that Captain Syd's lost treasure definitely, certainly, absolutely, maybe, possibly could be buried somewhere in Little Snoring castle. They're intent on searching the old castle until they find it, even though hotshot Hollywood director Bigwig Junior the Third has taken over to film his new movie, Raiders of the Lost Shark. It turns out there's an even bigger problem in their way, however. The Ghastly McNasty twins — the nastiest pirates ever to sail the seven seas — have returned to Little Snoring, and this time they're determined not to let the children thwart their own search for Captain Syd's treasure. Can Tat and Hetty find a way to outsmart the greedy and grouchy and grumbly and very, very grubby, Gruesome and Grisly McNasty once again?