Murder in Mesopotamia

At the request of archaelogist Dr. Eric Leidner, Amy leatheran has accepted a position as companion to his wife, Louise, a woman prone to " nervous terrors"- and in need of companion. She's found one in Amy. But what is the young nurse to make of Mrs.Leidner's bizarre stories of her first husband, a dead German spy, who hs returned in a rage to destroy her new marriage?