The Madman Theory

From Author Wars - https://authorwars.com/publications/the-madman-theory-43485.html

Overview:

Title: The Madman Theory
Author: Ellery Queen
Year: 1988
ISBN-10: 1870532015
Publisher: Kinnell
Price: £9.95
Pages: 155
Binding: Hardcover
Type: Novel
Title Reference: The Madman Theory
Notes: Originally published with a dust jacket with the title "The Mad Man Theory". The title on the spine is also given as "The Mad Man Theory". The title page gives the title as "The Madman Theory", as does the later dust jacket. "The first UK and first hardcover edition" on the copyright page. Cover art credited on the rear jacket flap. Month from Locus1.