The Book of the Dead — Paul Davis

a body in the Library... a death on the Nile... a legendary treasure... When an archivist is murdered in the Great Library of Alexandria, the Roman Prefect of Egypt persuades his Egyptian doctor, Kaires, to join the suspects, a group of scholars, on a trip down the Nile. As the boat glides past the cities of the Delta on its way to the Pyramids, other murders occur before a deadly secret involving unimaginable wealth is uncovered â€" but can Kaires solve the mystery before he himself becomes a victim?