A body underground. An ancient ritual. A killer in the shadows.

The real game is just beginning...

When a body is found in the depths of Mary King’s Close, DCI 'Mac' McNeill is thrust into a case involving the burden of sins and an old ritual tied to absolution.

With each clue, he is drawn closer to a confrontation with a killer driven by a twisted sense of justice.

As the investigation intensifies, Mac faces threats from a powerful adversary within the force, who aims to dominate the criminal underworld. Forced to protect those he cares about, Mac sends Clio and her daughter to safety on Skye, where he must finally confront his traumatic past.

But just as the truth feels within reach, a shocking discovery changes everything.

Someone has been watching.