Which Christie novel features a murder at an archaeological dig in Iraq?

The Christie novel featuring a murder at an archaeological dig in Iraq is Murder in Mesopotamia.

Published in 1936, the novel follows Nurse Amy Leatheran, who is hired to care for Louise Leidner at an excavation near Hassanieh. Louise is the wife of archaeologist Dr Eric Leidner, and the camp becomes increasingly tense as she receives threatening messages apparently connected with her first husband. When Louise is murdered, Hercule Poirot is called in to investigate.

The setting reflects Agatha Christie’s personal experience in the Middle East. She visited archaeological sites including Ur with her second husband, archaeologist Max Mallowan, and used details from that world in the novel. The dig supplies an unusual closed-circle setting: the remote camp limits escape while professional rivalries, personal secrets and old identities create a crowded field of suspects.

It is sometimes mixed up with Death on the Nile or Appointment with Death, which also use distinctive Middle Eastern settings. Neither, however, centres its murder investigation on an archaeological excavation in Iraq.