The Cruelest Month (Chief Inspector Armand Gamache #3)

‘Many mystery buffs have credited Louise Penny with the revival of the type of traditional murder mystery made famous by Agatha Christie. . . . The book's title is a metaphor not only for the month of April but also for Gamache's personal and professional challenges — making this the series standout so far.’ 
--Sarah Weinman 
Welcome to Three Pines, where the cruellest month is about to deliver on its threat.
It's spring in the tiny, forgotten village; buds are on the trees and the first flowers are struggling through the newly thawed earth. But not everything is meant to return to life. . . 
When some villagers decide to celebrate Easter with a seance at the Old Hadley House, they are hoping to rid the town of its evil — until one of their party dies of fright. Was this a natural death, or was the victim somehow helped along?
Brilliant, compassionate Chief Inspector Armand Gamache of the SQ (Sûreté du Québec) is called to investigate, in a case that will force him to face his own ghosts as well as those of a seemingly idyllic town where relationships are far more dangerous than they seem.