The Counterfeit Guest

, is now a wealthy heiress. Young ladies in her situation ought to marry well -- as her friend Susannah Armitage has. But is Susannah's marriage to Colonel Crosby-Nash all that it seems? Mary thinks not, and when her suspicions lead to a meeting with the elusive spymaster Cuthbert Shy, he reveals the terrible truth: the colonel is a traitor. At Shy's request, Mary agrees to accompany the Crosby-Nashes to their country estate in order to discover his secrets. It is a perilous assignment, and the danger increases when her only means of communicating with Shy is murderously cut off. If only Mary could contact the redoubtable Captain Robert Holland -- but as he has inexplicably ended their friendship, his help seems out of reach....