My Mate Mark is a Hammerhead Shark! - Jeanne Willis

Mark the hammerhead shark doesn’t have it easy – unless he wears a disguise, waiters won’t serve him, and he can’t go anywhere without people screaming and running away or teasing him. But when a little boy befriends him on a cruise ship holiday, he can see something in Mark that everyone else can’t… could Mark be a harmless hero?