The upcoming FX series uses Jon Krakauer's nonfiction book of the same name to tell a heinous story of faith and murder

When news of the murder of Brenda Lafferty and her infant child surfaced in 1984, the Mormon community found itself in an uncomfortable place.  

According to Ron, God instructed him to kill Brenda and her child. Nearly forty years later, this disturbing, yet engrossing story has made its way to television. 

On Thursday (April 28), FX will unveil the first two episodes of Under the Banner of Heaven, starring Andrew Garfield as Detective Jeb Pyre. 

Throughout the series, Pyre (a member of the church, himself) investigates the real life murders of Lafferty and her child while reckoning with his own crisis of faith.  

Krakauer's book, Under the Banner of Heaven: A Story of Violent Faith, operates as a straight-forward investigation into the deaths of Lafferty and her infant-aged daughter, Erica.  

In the opening pages of the novel, the initial situation is clear: Brenda's husband and Ron's youngest brother, Allen, returned home from work  

found both his wife and daughter with their throats slit. Allen believed that his brother, Ron, had a hand in the murder.