Harry Is a Party to Murder

Private eye Harry Bittercress must catch a killer who strikes every Christmas, targeting members of one hapless family. Harry's best clue is a cryptic poem, perhaps penned by the killer, maybe a fellow family member. Can Harry decipher it? Of course not. He has no knack for that. But his wife Cardamine does. She's a whiz at decryption, having studied at Bletchley Park, the British Government's codebreaking headquarters. But can she unravel it in time? If not, someone in that family is doomed. Meanwhile, each of them frets, "Will I be next?"