Old Habits — Mary Pierce

She screamed, and her shriek echoed up the bell tower, but until the bells rang on Sunday, no one would know what happened to Sister Mary Agnes.All Hallows' Eve approaches, and Three Rivers is abuzz with activity. The town loves Halloween, with the decorations and the bonfire. And this year's Halloween parade is set to be the biggest extravaganza ever. Staff and students at Holy Assumption High have been raising money all year to pay for long-overdue repairs. Their Halloween Fright Night is going to be the culminating event, putting them over the top of their fundraising goal. At least, that's the hope.Mackenzie Prentice is thirty-five, has a touch of OCD, is addicted to sugar, may occasionally drink too much, and has those voices in her head commenting on her choices. In this fifth book of the Mackenzie Prentice Mysteries, Mack goes undercover with Chief Bronson to solve a nun's murder. Mack realizes she has demons of her own to exorcise as she stumbles along an endless labyrinth of missteps and dead ends, following a trail that is, at times, as cold as a sepulchre.