Time is running out for Boyd as he fights for justice against a powerful adversary.
Boyd investigates the disappearance of 16 homeless boys from Waterloo Bridge in the 1980s.
Boyd needs Sarah's expertise to help expose the state's involvement in Barclay's death.
Boyd suspects a cover-up when a missing student's DNA matches with an unidentified corpse.
As the case continues, the squad investigate Murray using Grace as bait. However, when one member is shot and one member is arrested, the case could go into turmoil, only for a connection to be revealed.
When the squad look into the case of an army activist discovered in London's sewer system they discover that the case may have more police connections than they originally thought.
The investigation into Claire Somers' death has seemingly unleashed a predator straight from the darkest childhood nightmare. But are they looking for a monstrous child-stealer, or misguided saviours?
After a woman is discovered stabbed in the eyes and incinerated in her car she is identified as Claire Somers, a neglected child who was taken into care, then later kidnapped in 1986 at the age of seven. Robert Fenchurch had his eyes stabbed out on the night Claire was kidnapped as her abductor fled the scene. The team soon find out that Claire had snatched 15-year-old Abigail Harding, who was found locked in a hotel room.moreless
Boyd is convinced that the missing Donald is not a murderer, and pushes his team to try to make sense of all the vague connections in the case and eventually confront the unfathomable evil lurking within the heart of this sad, unfortunate family.
Boyd has to break in a new team member of equal rank, Detective Superintendent Sarah Cavendish, a high-flyer recently grounded by a hushed-up failed operation. The team investigate the mystery of a missing banker to help the man's seemingly-cursed family find closure.