The Curse of the Pharaohs - Amelia Peabody Reprint edition

It's 1892, and Amelia and Emerson, who is now her husband, are back in England raising their young son Ramses, when they are approached by a damsel in distress. Lady Baskerville's husband, Sir Henry, has died after uncovering what may have been royal tomb in Luxor. Amid rumors of a curse haunting all those involved with the dig, Amelia and Emerson proceed to Egypt and begin to suspect that Sir Henry did not die a natural death. The accidents plaguing the dig appear to be caused by a sinister human element, not a pharaoh's curse.