Welcome to East Salem. A deceptively sleepy town where ancient supernatural forces are being awakened.

A local high-school girl is found murdered in a park amid horse farms and the wealthy homes of northern Westchester County, New York.

The shocking manner of her death intrigues forensic psychiatrist Dani Harris. All the suspects are teenagers who were at a party with the girl, yet none remembers what happened. Could one of them be a vicious killer? Or is something more sinister afoot, something tied to an ancient evil?

Across town, former NFL linebacker Tommy Gunderson finds his state-of-the-art security system has been breached by an elderly woman. Mumbling threats in Latin, she attacks him with an uncanny, preternatural strength.

Before he has time to process the attack, someone close to him is implicated in the girl's murder at the park. He agrees to help and finds himself working with Dani, the only girl who could resist his charm years ago when they were in high school.

A heavy darkness is spreading. Yet a heavenly force is also at work.

Dani and Tommy suspect there's more to the mystery than murder, more to their growing friendship than chance . . . and more to the evil they're facing than a mere human killer.

The evil in East Salem is no longer content to hide in the shadows.

Dani Harris thought there wasn't much left that could surprise her after serving as a forensic psychiatrist in East Salem. And Tommy Gunderson has faced few challenges in his life that he couldn't overcome by either physical strength or his celebrity status.

But as they race to uncover what's really happening behind the high walls of St. Adrian's Academy, it becomes clear that supernatural forces have been at work here for generations. And now their focus is on making sure Dani and Tommy don't interfere.

When the unseen becomes seen, faith is the only weapon strong enough to fight in a battle involving not just murder and betrayal, but angels and demons.