Nancy and her friends Bess and George tour the dangerous waters off the coast of Alaska on a posh new ship's maiden voyage, a journey that is overshadowed by a series of deaths and near-misses that reveal the work of a saboteur.

"Twelve-year-old Fish--nicknamed for his skill as a swimmer--never intended to become a pirate. For starters, he's just a kid from a poor farming family, and second, he absolutely hates to fight. But after his parents send him to work as a courier, one of his deliveries is stolen, and as Fish hurries to get it back, he's captured by a ship of scalawags. And the mysterious package? It's the key to locating the Chain of Chuacar, a legendary treasure....

In 1940, a group of British children, their escorts, and some sailors struggle to survive in a lifeboat when the ship taking them to safety in Canada is torpedoed. Includes historical notes.