William Le Queux 
Guilty Bonds 

"In Guilty Bonds" by William Le Queux, newly rich Frank Burgoyne falls in love with a Russian spy only to become involved in a massive, international plot concerning a series of murders. Excerpt: "Come, have another hand, Burgoyne." "I’ll have my revenge tomorrow, old fellow, " I replied. "Why not tonight?" "It’s past two, and I have a long walk home, remember." "Very well; as you wish."