A Killer Halloween (Mt. Abrams Mystery #3)
Dee Ernst

Trouble was, Ellie had sworn off meddling in murder. She promised her boyfriend, police detective Sam Kinali, that she would never again put herself in danger by sticking her nose where it didn’t belong. So when the main suspect was a friend of Ellie’s daughter Cait, and Cait believed him innocent, Ellie deputized all her friends to do the snooping for her, and to help find out who killed Mr. Scarecrow
This novella is 30K words, the third in the Mt. Abrams Mysteries Series