Avast ye landlubbers! Things take a swashbuckling turn when Rob and the gang set out across the lake to help Marnie Beaver make some pies, but proceed to get captured by pirates! Or - more specifically - Pie-Rats! The dreaded Captain Ratzberry and his band of pernicious Pie-Rats want to know the whereabouts of Marnie's pies, and will stop at nothing to get them! How are the gang going to get out of this one?