A true-crime podcaster is found brutally stabbed to death in her home after walking her child to the bus stop. At first, all signs point to those closest to her. But when a friend and fellow podcaster digs into her obsession, a cold case laid to rest for fifteen years, and later turns up dead too, local police and the FBI realize that a serial killer dubbed the Silent Stalker could be striking again for the first time in years.
With the FBI called in and no leads to follow, they quickly realize they need a brilliant mind to crack the case: FBI Agent Tara Mills. But Tara is reluctant at first. The case reminds her too much of her mother's when it's revealed that the victim's daughter, a selective mute, lost her mother at the same age as Tara. But Tara is compelled as she realizes it is only a matter of time before the killer strikes again. As she peels back each layer, she falls deeper into the darkest depths of her mind and into the nightmares she had tried so hard to escape.
Meanwhile, Tara digs deeper into her past, obsessed with revealing the mystery woman visiting her father in prison, which leads to a shocking discovery. As she battles her own psyche and more victims are murdered, Tara realizes that the key to solving it all could be what she finds most triggering: her connection to the victim's daughter. As she takes a path she fears to travel, deep into the depths of her mind, she unveils a truth she never expected.
