Island at the Top of the World — Ian Cameron

VANISHED!

A sea captain searches for his only son -- who disappeared while seeking the legendary whale's graveyard. But in his search, the brave captain finds a puzzle far stranger than his son's disappearance. Caught in the mysteries of a bizarre civilization, a remnant of the ancient Vikings, the captain must battle both a strange people and the defiant forces of nature in his harrowing trek across frozen wastes and raging seas.