From the back of the book:
Henry, Jessie, Violet, and Benny used to live alone in a boxcar, but now they live with their grandfather. And he's taking them on a wonderful cruise in the Caribbean!
No sooner has the cruise begun, than things start to go wrong. The ship's radio breaks. It appears someone has fallen overboard-but it turns out to be a false alarm. And then there's engine trouble. Is someone deliberately tampering with the ship? It's a mystery-and fortunately the Boxcar Children are on board!
