Thomas was born in Wales, in a cemetery keeper’s cottage where his grandmother lived. He had his first story published at nine years old in a Boys Own Paper competition. With his father in the RAF, he traveled widely and was educated at the Cairo High School, the Maritz Brothers in Port Elizabeth and, finally, at Bedford Modern.

His first book, completed at the age of seventeen, is the story of a British spy in Russia during World War 2, titled Descent Into Danger. He refused the offer of a job at a university in order to accompany a traveling fair for a year: he used those experiences for his novel Bed of Nails. Since then his books have been published worldwide. He has been a foreign correspondent beginning with the Suez Crisis and ending with the first Gulf War. He was a BBC writer/producer for three flagship BBC programmes: Man Alive, Tomorrows World and Horizon. He is a regular contributor to Facta, the respected monthly Japanese news magazine, and he lectures widely on the secret world of intelligence. He also provides expert analysis on intelligence for US and European television and radio programs.

His book Mossad's Secret Warriors became a major documentary for Channel Four that he wrote and narrated: The Spy Machine. It followed three years of research during which he was given unprecedented access to Mossad’s main personnel. The documentary was co-produced by Open Media and Israfilm.

Gideon's Spies: Mossad's Secret Warriors has so far been published in 16 languages. A source for this book is Ari Ben-Menashe, a self-described former Mossad agent. According to Charles Foster in Contemporary Review: "Writers who know their place are few and far between: fortunately Mr Thomas is one of them. By keeping to his place as a tremendous storyteller without a preacher's pretensions, he has put his book amongst the important chronicles of the state of Israel." [1]

In his book "Gideon's Spies" Thomas alleges that: "The surgeons insisted there was no possible gunshot wound that would have allowed Rabin to leave the attack site showing no evidence of a wound and arrive at the hospital with multiple damage ... subsequently the doctors have refused to discuss the matter." Yitzhak Rabin`s third wound - "The Rabin Murder Fraud" In 2003 he alleged that a flotilla of 28 Al Qaeda ships was about to attack Britains North Sea oil drilling platforms. In 2003 he accused the Anti-Defamation League of blocking distribution of one of his books.

Book clubs

Gordon's works have appeared in:

• The Book of the Month Club
• The Literary Guild Book
• The Readers Digest Book Club

Film Translations

• Voyage of the Damned won five Academy Award nominations
• Enola Gay won the Emmy Awards Foreign Critics Prize
• Experiences won the Experiences won the Juries and Critics prize at the Monte Carlo Film Festival