My Mate Mark is a Hammerhead Shark!

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?