A new wellness app promised to silence her demons. Instead, it let her hear someone else’s.

Now, the thoughts of a captive woman are screaming in her head, and a killer knows she’s listening.

For recovering addict Allison, sobriety is a fragile, quiet hell. She craves the sharp, artificial focus of her past and would do anything to feel in control again. When she discovers Beta Sync—a leaked neuro-tech app that promises mental clarity—it feels like a miracle.

But the "clarity" is something else entirely: the unfiltered consciousness of everyone around her.

It's an intoxicating new power, a high she can't resist. At first, it's a game. Then, she tunes into the mind of her quiet, unassuming coworker, Barry. And through him, she hears the looping, desperate thoughts of a woman he's holding prisoner in his house.

Who would believe her? With a history of stimulant-induced paranoia, her own sponsor thinks she’s relapsing. The police see a troubled woman pointing a finger at a model citizen.

Allison is alone with this horrifying secret. Worse, Barry knows she can hear him. And he’s started laying traps for her in the psychic silence.

As the captive woman's hope begins to fade, Allison must master the dangerous power she’s addicted to and confront the monster next door. If she fails, more than one life will be lost to the darkness.

Perfect for fans of Freida McFadden, Lisa Jewell, and Blake Crouch, this gripping psychological techno-thriller explores the terrifying intersection of technology, addiction, and the dark secrets hidden behind a neighbor's smile. Scroll up and click 'Buy Now' to enter a world where your darkest thoughts are no longer your own.