In his third adventure, 12-year-old Brock Ford joins his uncle, world-famous anthropologist Dirk Armstrong, on an expedition into the Yukon valley of Alaska to study the lives of the Inuit people. While in the Alaskan wilderness, Brock is caught up in a mystery involving an old ghost town and a lost gold mine. And just when he thinks he understands the connection between the two, he comes face to face with a strange creature known to the Inuit as the Urayuli.