It’s a typical farmhouse kitchen. A large table fills the space, and in one of the chairs is the lifeless body of Doctor Magnusson. Under his feet and the dusty wooden floorboards lies the basement–and twelve therapy rooms. Behind each locked door, the victims are about to be rescued....

When a world-renowned psychiatrist is found dead in an abandoned ranch house in the Californian Santa Carina Valley, a Post-it note with the words “Susan Parker” and a cell phone number is taped to the basement door.

Still grieving her husband’s devastating suicide less than a year ago, FBI agent Susan Parker is taking a break from work and trying to rebuild her life as a single mom to her seven-year-old daughter, Natalie. When she’s called to the crime scene of Doctor Magnusson, a chill runs down her spine.

For years, Susan had been trying to hunt down the doctor, convinced he was the serial killer known as "Splinter." Someone is playing a cruel game with her, and they’ve only just begun.

Desperate to speak to the twelve victims rescued from the locked therapy rooms, Susan finds herself faced with a wall of silence. Why won’t they talk?

Battling her demons while confronting the toughest case she’s ever had to solve, Susan discovers a chilling truth about the true nature of Splinter–a killer preying on those seeking therapy.

But that’s not all she finds....

She’s about to uncover the shocking secret behind her husband’s death–one that links him to the Splinter case.

With her family’s safety hanging in the balance and her career on the line, can Susan protect her precious daughter and prevent a new killing spree before it’s too late?

A totally addictive and heart-stopping thriller that will have fans of Robert Dugoni, Charlie Donlea, and Lisa Regan listening late into the night.