This is book 4 of the "Travis McGee" series.

This note contains spoilers for the book.

Fourth of the Travic McGee books, and the fourth to be published in 1964, too.

An interesting blackmail plot, involving pictures of an inadequately hidden outdoor sex party. Once again the action is largely outside of Florida. I guess it took him awhile to decide (or convince his publishers?) that Florida was well enough known to set books there.