The Dark Edge of Night

"Sharp eyed and sharp mouthed police detective"* Henri Lefort, is determined to solve homicides and uncover any German conspiracies threatening France—in Mark Pryor's newest World War II mystery, The Dark Edge of Night.
Winter 1940: With soldiers parading down the Avenue des Champs-Élysées, Nazi flags dangling from the Arc de Triomphe, and the Eiffel Tower defaced with German propaganda, Parisians have little to celebrate as Christmas approaches. Police Inspector Henri Lefort's wishes for a quiet holiday season are dashed when the Gestapo orders him to investigate the disappearance of Dr. Viktor Brandt, a neurologist involved in a secret project at one of Paris's hospitals.
Being forced onto a missing persons case for the enemy doesn't deter Henri from conducting his real job. A Frenchman has been beaten to death in what appears to be a botched burglary, and catching a killer is more important than locating a wayward scientist. But when...