Note:

• According to Message #27 on this thread at the Keith Laumer forum, the 1974 Berkley Medallion printing was mishandled and the copy inside the physical book was the title The Man in Question by John Godey.
• This novel was revised for its 1982 publication and its title was slightly revised.

Synopsis: A soldier of fortune named Florin, whose earlier adventures have left his mental faculties in a precarious state, is hired to bodyguard one Lance Bardell, a Senator whose own mental state is utter chaos. In exploring Bardell's delusions, Florin must enter the Dream Machine - which assaults not merely the senses but reality itself. Plunging into and out of hair-raising adventures, combating an extra-galactic threat to Earth's existence, as well as defending his own sanity, Florin comes to astonishing discoveries about the universe he lives in and defends - and about himself! (adapted from the text published with the first edition)