Time flies when you're having fun . . . Even if you're Mortimer DeVere, the 10,000 - year - old - boy. When unwelcome visitors arrive on spooky Unk Island, Mort and his sister Agnetha are plunged headlong into a dangerous race against time, tigers and the terrifying Trish. And, as their strange, secret collection of historical creatures begins to turn against them, the DeVere children discover that today may soon become the weirdest and wildest 24 hours of their very long lives!