Jago and the Book of Ages

Jago, on holiday in Whitby with his brother, sister and two friends, discovers by chance that not only is he a seventh son of a seventh son of a seventh son, but that he has magical talents. Only he can thwart an evil genius who is determined to change history. He travels back into Whitby's past, meeting Captain Cook, whalers, jetworkers, Vikings and many more as he desperately tries to save the town.