Murder in Mesopotamia

Murder in Mesopotamia - Agatha Christie [These notes were made in 1983:]. The closed circle this time is an archaeological camp, with the usual red-herring characters. Add a slightly incredible subplot about the past. Then proceed on the assumption that the least likely character is actually the murderer (in this case the woman's husband); add in the voice of a "sensible woman" as narrator; bring in Hercule Poirot half way thru. I swear I could write the things myself!