When Gray retrieves an engraved narwhal's tusk from the sea disturbing changes begin to happen to both marine and bird life. The islanders suspect Gray's unusual powers of being able to communicate with seals and other creatures as the cause of the unrest. They find the tusk he has hidden away and fear that an ancient prophecy threatening the island will come to pass since they have always considered the narwhal as an omen of disaster. Gray finds...