Miss Hildegarde Withers is spending the reward money from the last investigation she was involved in on a trip to Europe. Unfortunately, she is seasick the first few days of the voyage and misses out on the activities that presumably drive a young lady to suicide by leaping off the ship six hundred miles from Or was the young lady pushed or pulled off the ship? The bar steward is accused of murdering her and takes cyanide in full view of the police. This clears up the case, in the minds of some. Later on, however, the ship's passengers who dined at the table with the no-longer-presumed suicide start getting black-bordered warnings. Then one of her tablemates dies, seemingly by accident. Another comes near death by poisoned cigarettes, obviously not a fortuitous circumstance.