Title: Sharks. Sentence 1: The newlywed couple went to the Bahamas for their honeymoon. Sentence 2: One of their excursions was to ride on a glass bottom boat. Sentence 3: The boat captain held a fish over the side of the boat. Sentence 4: Suddenly sharks were surrounding the boat, and jumping for fish.
I gave him a map of the area, as the book's setting is nearby.