William Le Queux 
THE MYSTERY OF THE GREEN RAY (British Mystery Classic) 
A Thrilling Tale of Love, Adventure and Espionage on the Eve of WWI

It is the dawn of The Great War. Young Ronald Ewart is ready to be enlisted, but before he does, he travels to Scotland to visit his fiancée Myra Mc Leod. While out fishing together, Myra inexplicably loses her sight after witnessing a green flashing light. Her father has an odd experience as well, and then Myra’s faithful dog also goes blind. They turn to a leading eye specialist who happens to be a bit of an amateur detective and he takes on himself to resolve the mystery of the green ray.
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.‘