‘Mom?’ The word caught in the boy’s throat. She didn’t try to speak, didn’t roll towards him. She didn’t move at all.

In the middle of the night, 14-year-old Samuel is woken by a terrified scream. The police arrive to find him sobbing on the kitchen floor, cradling his mother’s lifeless body, but they hit a dead end before the investigation has even begun - although he witnessed the murder, Samuel is blind.

But when Detective Jessica Daniel meets the boy, the way he uses just his sense of sound to accurately locate her hand to shake it convinces her that this clever young teenager could hold the key to the entire case.

Samuel’s description of an intruder he heard walking with a limp leads Jessica to an isolated seaside town, where a well-liked local man has been missing for days. Breaking into his house, Jessica finds him lying flat on the bed, a bullet wound under his chin.

Digging into the victim’s work records, Jessica uncovers a secret he shared with Samuel’s mother and it’s clear she was terrified for her son’s safety. Soon, Jessica’s career is on the line … and so is Samuel’s life.