Slight Mourning by Catherine Aird

Usually the admonition is not to have thirteen people sit down to dinner because one will die. In this case, it was only twelve but one is still dead. In fact, the host was killed by a large overdose of drugs. Then another guest, the amiable but fat (like seriously, her weight is mentioned a LOT) Mrs. Marchmont is killed as well. It is up to Inspector Sloan to come in and figure out what is going on.  
There were a lot of characters and it was sometimes hard to keep track of who was who. And, to be honest, the solution seemed to come a little bit out of nowhere, even with the explanation at the end. But I still enjoyed the character development as well as the ride to get to the end.

Three stars

Follows His Burial Too

Followed by Parting Breath

This book came out in 1975

Ebook borrowed from Audible

Opinions are my own