Abigail and her friends have a slumber party at the barn with Mr. Big Bob, the miniature horse and his new roommate, a little white barn mouse named Swiss. Swiss tells a story with clues about the whereabouts of one of their missing friends, Pirate Dog. Champ tells everyone, sadly, that he's leaving. He'll be working on a "Special Canine Rescue Operation"... but he has good news too! Champ introduces his baby son Champson who will be staying home! Abigail plans a weekend full of adventure for all of her friends... an overnight camping trip down to the river! They enjoy swimming, collecting seashells and the glow of a campfire. Skully is certain he's spotted himself a pirate... could this be Pirate Dog?