William Le Queux 
THE GAY TRIANGLE – Spy & Adventure Tales of the Fearless Trio [EPUB ebook] 
The Mystery of Rasputin’s Jewels, A Race for a Throne, The Sorcerer of Soho, The Master Atom, The Horror of Lockie, The Peril of the Préfet, The Message for One Eye Only…

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.’