The Gay Triangle is a collection of stories about three friends and their adventures around Europe in a car that converts to an airplane and a helicopter. Dick is an inventor and a former RAF pilot who constructs weird machines that always come in handy. Yvette is his French love interest and a daring operative willing to invade any space at all risks. Jules is Yvette's brother who stands guard, ready to rescue Yvette at any time.

These are the stories:

The Mystery of Rasputin's Jewels

A Race for a Throne

The Seven Dots

The Sorcerer of Soho

The Master Atom

The Horror of Lockie

The Peril of the Préfet

The Message for One Eye Only

William Le Queux (1864-1927) was an Anglo-French writer who mainly wrote in the genres of mystery, thriller, and espionage, particularly in the years leading up to World War I. His best-known works are the anti-French and anti-Russian invasion fantasy "The Great War in England in 1897" and the anti-German invasion fantasy "The Invasion of 1910."