Agent in the Shadows by Alex Gerlis

With a traitor among the pack, who can be trusted? The scintillating final instalment of the Wolf Pack series. June, 1943. In Lyon, the capital of the French resistance, a secret meeting is held under orders from General de Gaulle. The meeting's objective is to unite all the resistance factions into one effective body. But when the meeting is suddenly raided by the Gestapo under Klaus Barbie, otherwise known as the 'Butcher of Lyon', the plan disintegrates and the leaders are captured. The movement has been cheated: there is a traitor somewhere in Lyon. British agent Jack Miller and Berlin undercover spy Sophia von Naundor are sent to France to uncover who it is. But with the Gestapo closing in and more traitors emerging from the shadows, it's harder than ever to keep the wolves at bay. This unmissable espionage thriller from modern master Alex Gerlis is perfect for readers of Charles Cumming and Rory Clements