Thou Shell of Death. A Nigel Strangeways Mystery, Paperback

Fergus O'Brien, a legendary World War One flying ace with several skeletons hidden in his closet, receives a series of mocking letters predicting that he will be murdered on Boxing Day. Undaunted, O'Brien throws a Christmas party, inviting everyone who could be suspected of making the threats, along with private detective Nigel Strangeways.