Flinn is hot on the trail of some stolen treasure & he knows exactly who's to blame.
With the help of his friends
Flinn is at school looking in the art cupboard for some coloured pens to finish off his dinosaur drawing when he stumbles upon Captain Stubble, a real live Pirate Captain! He tells Flinn that his ship, the Acorn, has been stolen & that he needs Flinn to help him rescue it back.