E. Phillips Oppenheim 
Havoc [EPUB ebook] 

Havoc occurs when European countries are discussing covert alliances. The story revolves around the creation of a secret alliance between Germany, Russia, and Austria. The English hope to split Russia away by holding the Czar to his previous public commitments, but they need proof of what was done to create the pressure. All the pressures that lead to WWI are there, but the intrigues and secret treaties create an interesting background to the twists and turns of the plot of this novel written in 1911.