The CrimeThe customers in a London convenience store are taken captive. Among them is young mother, Detective Helen Weeks. She is told her life depends on the co-operation of one of her colleagues - detective Tom Thorne.

The DemandAkhtar is desperate to know what really happened to his beloved son, who died a year before in prison. He is convinced the death was not an accident and forces the one man who knows more about the case than any other, Thorne, to re-investigate.

The TwistWhat Thorne discovers will upend everything he thought he knew about the fate of those he's put away...but will it be enough to fulfill the wishes of a grieving and potentially violent father?