House of the Hunted by Mark Mills

Côte d’Azur, France, 1935: As Europe moves inexorably toward war, Tom Nash feels pleasantly removed, pursuing a quiet writing career on an idyllic stretch of the French Riveria. A former intelligence operative for the British government, Tom now finds refuge among the lively seaside community of expats and artists, hoping to put the worst deeds from his job—and memories of the woman he once loved—far behind him. But Tom’s peaceful existence is shattered when an unknown hit man tries to kill him in his sleep. Tom is sure that somebody knows his secrets, and that this attempt on his life won’t be the last.
 
Relying on his instincts for self-preservation, Tom suspects everyone of double-dealing, even people he considers his the Russian art dealers from Paris, the exiled German dissidents, even his former boss and closest confidant. And as he plunges further into his haunted past, Tom feels himself turning into the person he used to be—a dangerous man, capable of anything.  
 
Combining vividly drawn characters and gripping acts of espionage, House of the Hunted is a superbly crafted novel by an exceptional and versatile storyteller.