This is book 10 of the "Travis McGee" series.

This note contains spoilers for the book.

Travis gets asked to check out how the daughters of an old client are doing. They're not doing too well. McGee hits double digits (10th volume).

More psychoactive drugs -- this time something that wipes recent memory. More nasty, greedy, manipulative people. More innocent people dying. Far too many suicides, including people trying 4 times with 4 different deadly methods before succeeding (which cues Travis in that it's a murder).