Cockpit by Jerzy N. Kosinski

An agent known only as Tarden is a former operative of the mysterious security agency "the Service." He has erased himself from all dossiers and transcripts. Now a fugitive, he moves across the landscape free of identity, in search of adventure and intrigue. But Tarden is a man of many disguises, and he is alternately avenger and savior, judge and trickster, as he enters the lives of others, forcing them into the arena of his judgement. In Cockpit, Kosinski is at his most startling and powerful, stripping away pretension and illusions of security to reveal the source of real strength within.

Hardcover, 1975

Goodreads: 3.67