The Seventh Sinner by Elizabeth Peters

The first of the Kirby mysteries. Jacqueline Kirby, librarian extraordinaire, is in Rome. She bumps into a young man and woman and is soon introduced to their circle of friends. Then, one of that circle is killed and Jacqueline is off on her first murder...

Three stars

Jacqueline Kirby #1

This book came out ini 1972
Followed by The Murders of Richard III

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Opinions are my own

The Murders of Richard III by Elizabeth Peters

Jacqueline Kirby is visiting and old friend in England. While there, she is invited to go with him too a country manor where a group of current day Richard III sympathizers will reenact his life before a letter is unveiled proving that Richard did not kill the princes in the tower.
But someone begins playing malicious pranks on the guests portraying Richard's rivals in the same order that Richard supposedly killed them. 
Not my favorite Kirby novel but still shows Jacqueline's amazing sense of humor. And is amazingly better as an audiobook.

Three stars

Jacqueline Kirby #2

This book came out January 1st, 1974
Follows The Seventh Sinner
Followed by Die for Love

Audiobook from Audible Premium Plus
Opinions are my own

Reread as Blackstone Audiobook April 2025