Hour of reckoning

The novel Hour of reckoning continues the series of investigations of senior inspector Arman Gamash. This charming character was created by the pen of Louise Penny, the only five -time laureate of the Agatha Christie Prize in the world.
Tired of the prolonged inaction after the resignation, Arman Gamash accepts the proposal to head the police Academy of Quebec. He has a titanic work to reform this extremely dysfunctional educational institution. Where is the best thing to prepare for new battles, if not in the silence and comfort of your own house - there are three pines in the village? Meanwhile, in the village bistro during the repair, a mysterious manuscript map of three pines, which had been in the wall for about a hundred years, is found during the repair. Who drew this strange card and for what purpose? Gamash instructs four cadets of the Academy to solve this riddle. But their research is suddenly interrupted by a terrible event: one of the teachers was killed in their apartment in the Academy building, and a copy of the map was found in his bedroom. Is the killer one of these four?