A city on the brink.

A mother on the edge.

A nightmare that only DI Helen Grace can end.

Sometimes, the darkest secrets hide in plain sight...

Naomi's mother is desperate for help - and Detective Inspector Helen Grace is her only hope to find her daughter.

But with the police under fire as a gang war grips the city, Helen will have to defy direct orders to search for Naomi.

Soon, Helen's secret investigation uncovers more people disappearing from the city streets, leaving behind a disturbing trail of questions in their wake.

The clock is ticking - and the only person looking for Naomi is about to meet her match..