i gripped my parasol firmly
Elizabeth Peters is the author of many charming and witty mysteries, and a very few that I didn't like as well. She has (at least) three main series, and a number of singletons.
Of the series, my favorite concerns Amelia Peabody. The books, which begin with Crocodile on the Sandbank, The Curse of the Pharaohs, and The Mummy Case take place in the world of Egyptology at the end of the 19th century. (Peters, herself an Egyptologist has written two nonfiction books about ancient Egypt under her real name: Red Land, Black Land and Temples, Tombs and Hieroglyphs, by Barbara Mertz). The series commences when the sharp-tongued Amelia, a woman of independent means and an ardent feminist (at a time when feminism was as much a battle for practical clothing as for equality), travels to Egypt on vacation. She is soon caught up with murder, intrigue, and Radcliffe Emerson, an equally sharped-tongued archaeologist. The series gets more preposterous with each book (Peters is a fan of H. Rider Haggard, and also has a wicked sense of humor), but no less enjoyable. Highly recommended.
I'm less fond of her other series, which concern Vicki Bliss and Jacqueline Kirby, though with the exception of the first two Kirby books (The Seventh Sinner and The Richard III Murders) I found them enjoyable enough.
Jane and I particularly enjoyed one of her standalone novels, The Camelot Caper, which we read aloud. Also highly recommended.
For what it's worth, Peters also writes suspense thrillers under the name, but we haven't read any of them.