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.

When seventeen-year-old friends Liv and Will are accepted in a semester-at-sea program, they are excited to spend six weeks aboard the luxury cruise ship The Eos, but after Will disappears the first night, Liv grows suspicious that something sinister is lurking below deck.

On a seventeenth-birthday cruise with her parents and three friends just months after her boyfriend died, Natalie is surprised to connect with a fellow passenger, who then mysteriously disappears.

While on a mission aboard the The Emperor of the Seas, Ben Ripley faces off against his arch enemy, Murray Hill, on the high seas and quickly finds himself in hot water as things take a dangerous turn.

In 1889, the ship Etruria departs Liverpool, England, for New York carrying Audrey Rose Wadsworth and her crime-solving partner, Thomas, a famous escape artist, and a cold-blooded killer.