The Hardy boys have signed on with the crew of the Sea Spirit II, a perfect replica of a century-old schooner. It's a once-in-a-lifetime opportunity to test their skill, strength, and resourcefulness at sea. But the stakes suddenly turn dangerously real wen the ocean-bound adventure becomes a true voyage into terror!

What is the source of the ghastly apparitions haunting the ship? What treachery lies behind the attempt to set her aflame? What unknown force has risen from the waves, bent on destruction? Frank and Joe are at the eye of the storm, and they alone must find the answers...before the Sea Spirit II plunges to the icy depths of the shark-infested sea.