The Green Ripper

Blurb

The Green Ripper is a mystery novel by John D. McDonald, the eighteenth of 21 in the Travis McGee series. It won a 1980 U.S. National Book Award in the one-year category Mystery.
The plot is centered on revenge against a secretive, terrorist cult that is responsible for killing McGee's lover Gretel. The title is a word play on the name of the Grim Reaper. McGee's friend, Meyer, an economist, features prominently in the novel.