M. L. Huie returns with the next Livy Nash historical mystery, perfect for fans of Susan Elia MacNeal's Maggie Hope series and Kate Quinn's The Alice Network.How far would you go to rescue a friend?British spy Livy Nash has never had many friends. But fellow agent Margot Dupont was the exception to the rule. At least, until she disappeared during one of their missions in World War Two, never to be heard from again. Since then, Livy's made do. Some people, you just can't replace. But when the British pick up Margot's call sign--NIGHTSHADE--years after the war, Livy can't help the glimmer of hope that she might see her old friend again. But Livy has her doubts: what their enemies are using it to lure out Livy and her team? What if it's all a trick?Despite her unease, Livy dives headlong into finding Margot, aided by her boss, the charming Ian Fleming. When evidence arises that a handsome Russian spy might have information about Margot, Livy agrees to her most dangerous mission yet: going undercover as a double agent to spy on the infamous "Red Devil".As Livy is pulled deeper into the shadows of treachery, the possibility of finding Margot alive diminishes as the danger grows. How much will she have to sacrifice to find a friend she thought she'd lost forever?