Flo needs a new summer dress. Ebb is left behind to guard Flo's favourite hat. Ebb dozes on deck and Jasper the boatyard cat comes looking for food. Ebb is woken by a loud crash. Ebb & Bird panic and hide. Then they see Flo's hat move about the boat. Bravely, Ebb finds Jasper underneath. Jasper flees. Flo returns in her new summer frock and Ebb is praised for guarding her hat.