Under the Banner of Heaven

Nope. This book is by Jon Krakauer, not Mitch Albom. And it's nonfiction.

Krakauer dissects the situations that lead to the massacre of a mother and her daughter.

Because it relates to religious extremism.

Very much. Krakauer has a gift of unbiased reporting and gutsy story telling. He simplified a complicated history of Mormonism, wrote interviews, compiled names, dates, events, and composed an eye-opening documentary of religious idealism gone awry.