Secrets and Snowflakes - Evans S. Usher

The Witzel Winter Solstice Party is the highlight of an otherwise quiet winter season in Pigsend. But when Vellora and Ida Witzel start receiving mysterious, threatening letters, the party - and their own safety - may be in jeopardy. 

Across the street, Bev's got an inn full of suspects - and a freak winter storm to keep them all in one place. They all have their secrets, and it's a race against time and melting snow to figure out who's blackmailing the butchers - and which secret they're threatening to expose. 

The third book in the Weary Dragon Inn series is a cozy follow-up to Fiends and Festivals.