A series of baffling murders among a group of imprisoned agents threatens the outcome of World War II in this chilling mystery from the New York Times bestselling author of Mr. Churchill's Secretary. World War II is raging, and former spy Maggie Hope knows too much.She knows what the British government is willing to do to keep its secrets. She knows the real location of the planned invasion of France. She knows who's lying. She knows who the double-crossers are. She knows exactly who is sending agents to their deaths. These are the reasons Maggie is isolated on a remote Scottish island, in a prison known as Killoch Castle, out of contact with friends and family. Then one of her fellow inmates drops dead in the middle of his after-dinner drink--and he's only the first. As victims fall one by one, Maggie will have to call upon all her wits and skills to escape--not just certain death . . . but certain murder. For what's the most important thing Maggie Hope knows?She must survive.Advance praise for The Prisoner in the Castle "The colonel sums it up best on page ten: 'If you take a pretty girl and teach her how to kill, it can cause problems.' Not just problems--electrifying action and nonstop surprises. I loved this book!"--R. L. Stine, author of the Goosebumps and Fear Street series "Perfectly paced and brimming with intrigue and rich historical detail, The Prisoner in the Castle is an extraordinarily satisfying novel. Susan Elia MacNeal proves once again that she is a master, both at crafting characters and creating suspense."--Tasha Alexander, New York Times bestselling author of the Lady Emily mystery series "The Prisoner in the Castle had me at 'a new Maggie Hope mystery,' but once you add And Then There Were None and a Scottish castle, how could any mystery reader resist? Darkly atmospheric, enchantingly macabre, and as beautifully woven as a clan tartan."--Lauren Willig, New York Times bestselling author of The English Wife "The Prisoner in the Castle is a double agent of a novel! At the outset, it appears like a clever riff on Agatha Christie, but a few quick turns prove it to be an utterly modern, gripping thriller. Maggie Hope is smarter than ever, and Susan Elia MacNeal is truly at the height of her powers."--Sujata Massey, author of The Widows of Malabar Hill