The Small Boat of Great Sorrows - Dan Fesperman

Vlado Petric, a former homicide detective in Sarajevo, is now living in exile, and making a meagre living working at a Berlin construction site, when an American investigator for the International War Crimes Tribunal recruits him to return home on a mission.
The assignment sounds simple enough.
He is to help capture an aging Nazi collaborator who has become a war profiteer. But nothing is simple in the Balkans: Petric is also being used as bait to lure his quarry into the open, and when the operation goes sour he is drawn across Europe into a dangerous labyrinth of secret identities, stolen gold, and horrifying discoveries about his own family’s past.

Intelligent and suspenseful, The Small Boat of Great Sorrows brings together chilling crimes, the lies people live and the cold facts of international politics into a masterful, electrifying thriller.