Quick recap
Nurse Amy Leatheran is hired to look after Louise Leidner, wife of the leader of a dig in Iraq. Louise is terrified: she's getting threatening letters that seem to come from her first husband, thought killed in the war. Soon she's found dead in her room, her head crushed, though no one crossed the courtyard. Poirot is passing through and takes the case, with the nurse narrating. Another member of the expedition dies from drinking acid. Poirot reveals the killer is her husband, Dr Leidner, who was her first husband under a new identity. He killed her by dropping a heavy stone from the roof through her window.
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