Egleton began writing in the late 1960s, drawing upon his extensive military and intelligence experience. His debut novel,
A Piece of Resistance (1970), was the first in a trilogy set in an alternate-history Britain occupied by Soviet forces. He achieved wider recognition with
Seven Days to a Killing (1973), which was adapted into the 1974 film
The Black Windmill, directed by Don Siegel and starring
Michael Caine. Another notable work,
The October Plot (1974), a thriller about an assassination attempt on Martin Bormann, became an international bestseller. Egleton wrote over fifty novels in his career. Under his own name, he published numerous espionage thrillers, including the long-running
Peter Ashton series, which focused on British intelligence operations. As John Tarrant, he wrote three additional espionage novels. Under the name Patrick Blake, he novelized the 1979 film
Escape to Athena. His books were translated into fifteen languages, and he was regarded as one of Britain's leading thriller writers. == Later life and death ==