Le Queux, William: The Mysterious Three, LIT v.1, 23 November 2009.
 

William Le Queux (1864–1927)
The Mysterious Three (1915)

A tale of mystery and adventure. It is London in 1911. Dick Ashton is worried. Someone is threatening his beloved Vera. Then she goes missing…

“But where was Vera? Ah! I felt beside myself in anxiety—a breathless, burning longing, to know how fared the one woman in all the world who held me in her hands for life, or for death.
She loved me, truly and well—of that I was convinced. And yet she existed in that mysterious hateful bondage—a bondage which, alas! she dared not attempt to break.
What could be the truth? Why were her lips closed?—Aye, why indeed? I dreaded to think.”

The source was Manybooks and the file was full of OCR errors. I hope that I have managed to correct them all. The cover image is the casino at Monte Carlo.