E. Phillips Oppenheim 
The Vanished Messenger 

The conference of European Nations is taking place in The Hague. Mr John P. Dunster, an American, is travelling to the conference with important information relating to the seemingly inevitable outbreak of war. The document he carries could prevent the war entirely but when he disappears following a train wreck, Richard Hamel must solve the mystery – before it is too late. A classic mystery novel from popular author E. Phillips Oppenheim.