[sufue]

Seeing a Large Cat is the 9th in the excellent IMO (and the opinion of lots of others, I suspect, going by Peters' MWA Grand Master Award) Amelia Peabody series by Elizabeth Peters. It has dropped to $2.99 at Kindle and Kobo US. Most of the titles in this series don't go on sale very often in the US, so grab this one if you want it.

Kindle US: https://www.amazon.com/dp/B002WAUVK0
Kobo US: https://www.kobo.com/us/en/ebook/seeing-a-large-cat

Spoiler:

No villain is safe in 1903 Egypt as feisty archaeologist Amelia Peabody embarks on her ninth adventure.

According to an ancient Egyptian papyrus, dreaming of a large cat means good luck. And that's just what Amelia Peabody could use, as her growing family matures in the new century. What's more, Amelia's dashing husband Emerson has received a mysterious warning not to enter the Valley of the Kings. To Emerson's annoyance, Amelia's meddling distracts her attention as she exposes a fraudulent spiritualist, saves a marriage, and plays matchmaker. But diabolical forces are at work when an unknown tomb reveals a shocking murder -- and the Peabody family dodges bullets from an assassin determined to put an end to their discoveries.