Whisker is a Pie Rat apprentice on the treasure hunt of a lifetime. With the Forgotten Map and the King's Key safely in his grasp, Whisker joins the ratbag crew of the Apple Pie on their voyage to the mysterious Island of Destiny. Armed with scissor swords, flying pies and barrels of gravy, the Pie Rats must first pass through the Treacherous Sea where untold dangers lurk beneath the waves.