It's something Cory has to do. And only one thing stands in her way - the boy she loves. Seventeen year-old Cory Jacobson is on the most exciting adventure of her life, sailing aboard the Friendship Flyer to stop the terrible annual slaughter of baby seals off Thunder Island. Icebergs, thick fogs and raging high seas cannot hold back Cory and the Flyer crew from their mission. But once they arrive on Thunder Island, they face a much more dangerous challenge. Angry fur traders threaten them with violence unless they clear out. Cory feels trapped on all sides...until she meets a young seal hunter named Sean Flannery whose kindness both touches and confuses her. How can the most wonderful person she has ever met be part of the hated enemy she has sworn to stop? Should she love him - or fight him?