In the Shadow of Versailles. Max Anderson Mysteries, #1

The Great War has ended. From all over the world, politicians and diplomats gather in Paris to negotiate the Great Peace. But Max Anderson, former lieutenant in the Canadian Expeditionary Force, cares for none of that. With no home waiting back in Canada, he is determined to make a new life for himself in the City of Light. But soon he finds himself immersed in intrigue and political turmoil of the treaty negotiations.
The war may be over but the city is full of violent men pursuing violent causes, and when no one else seems willing to do the right thing, Max has no choice but to act.