Book excerpt: "Maggie Hope has come a long way since serving as a typist for Winston Churchill. Now she's working undercover for the Special Operations Executive in the elegant but eerily silent city of Paris, where SS officers prowl the streets in their Mercedes and the Ritz is draped with swastika banners. Walking among the enemy is tense and terrifying, and even though she's disguised in chic Chanel, Maggie can't help longing for home. But her missions come first. Maggie's half-sister Elise has disappeared after being saved from a concentration camp, and Maggie is desperate to find her--that is, if Elise even wants to be found"--