The Ghastly McNastys are the meanest pirates to ever sail the seven seas and are completely obsessed with treasure! They are closing in on Captain Syd's legendary hoard, but a film crew has come to Little Snoring and is right in their way. But there's a stroke of luck – they are making a pirate movie, and the McNastys think they can work as extras and steal the treasure! Youngsters Tat and Hetty have outwitted them before and can see what the dastardly duo is really up to – but will anyone believe them?