After the death of author Michael Crichton, the novel Pirate Latitudes was found on one of his computers. He had been working on it, possibly over a period of years, while also working on other books, books that were published. One can assume that Crichton would have done more work on Pirate Latitudes before having it published.
The book, set in the seventeenth century, tells of a fictional Harvard-educated privateer who, at the request of the governor of Jamaica, leads a raid on a Spanish island fortress in the eastern Caribbean. I bought the book from the limited selection available late at night in Pennsylvania Station, New York. The book, though not really very good, is good enough to while away the time in a waiting room or on a long train ride. But it is more like a good preliminary draft than a finished work.