Time flies when you're having fun . . . Even when you've lived for 9,990 years longer than your average ten-year-old. But when unexpected and unwelcome visitors arrive on Mortimer DeVere's home turf, the spooky Unk Island, he and his sister Agnetha will have their hands full dealing with some of the stranger hobbies they've tried to keep secret from one another and the outside world. Today may just turn out to be one of the most eventful days in Mort's very long life!