Convinced that his father, who disappeared at sea two years ago, is still
alive, 12-year-old Felix embarks on a search for him in the company of Old
Tom, a retired fisherman; Squawk, a thieving one-legged parrot; and Rover,
a cat who acts like a dog. Their journey takes them to Darkshadow Island,
where a secret community inhabits an underground city, ruled by the
megalomaniacal Morgäa, possessor of a priceless treasure.