Murder at the Royal Botanic Gardens by Andrea Penrose

Charlotte and Wrexford are getting married. That means that they are incredibly busy with wedding plans and the social twirl of being a newly engaged couple. It is at one of the parties, one at the Royal Botanic Gardens, that Wrexford is summoned into another room. He has gained a reputation for solving murders and the murdered man's friend is convinced this is not a natural death. Yes, the man had heart problems but the white powder around his mouth points to a different reason for death. 
An old enemy comes back and a new comrade (a cousin of Thomas Jefferson, no less) is made. 
A nice book with a branching into the botanic realm of the time, stepping out of the technical one a little bit. 

Wrexford & Sloan #5

Four stars

This book came out September 28, 2021

Follows Murder at Queen's Landing

Followed by Murder at the Serpentine Bridge

Borrowed as hard copy from library

Opinions are my own