From the back of the book:
The Bermuda Triangle is a 1990's sourcebook centered around the famous mystery of the Devil's Triangle. It acts as a guidebook to the entire Caribbean region, detailing not only Bermuda, Cuba, Jamaica, Haiti, and other nearby islands, but also exploring the mysteries of Rha'thylla, the Sargasso Sea, and more. Guidelines are include for running Caribbean campaigns. The book concludes with "The Privateer's Diary", a scenario set in the area.