第 20 季 共 10 集
播出时间：2017年1月3日
第 1 集 Identity (1)
播出时间：2017年1月3日
When a people smuggler is found dead in the City, Nikki must delve into London's illegal immigrant community. She meets a vulnerable Syrian teen called Akka who is in need of help, putting Nikki in a moral dilemma - and the killer is still on the loose.
第 2 集 Identity (2)
播出时间：2017年1月4日
When Nikki, Jack and Thomas make a horrific discovery in the van, they are confronted with the work of a killer who preys on illegal immigrants. With the help of Clarissa, they must work out where the killer will strike next before more vulnerable people meet the same fate.
第 3 集 Discovery (1)
播出时间：2017年1月10日
When a photogenic young schoolteacher goes missing, Jack and Nikki are called to the scene and quickly find themselves at the centre of a media storm. Meanwhile, Thomas fights a lone crusade for justice for a troubled young woman who was killed in puzzling circumstances.
第 4 集 Discovery (2)
播出时间：2017年1月11日
Having found a link between the two cases, the team struggles to make sense of it. Nikki visits a disgraced former colleague who may hold the key. Thomas uncovers the bizarre truth about how Tina died.
第 5 集 Remembrance (1)
播出时间：2017年1月17日
A woman's body found floating in the Thames leads Nikki and Jack to a community on the banks of the River Lee. Three years ago a teenager called Ruth Tresize went missing from the area, leaving the locals haunted by suspicion and grief. A fresh spate of killings reopens these old wounds.
第 6 集 Remembrance (2)
播出时间：2017年1月18日
Nikki is under fire for leaking information on a suspect, and Thomas is called in to play peacemaker. Jack and DI Ashton track down the mystery witness. Before the killer strikes again, the team must uncover the true story of Ruth Tresize's disappearance three years earlier.
第 7 集 Covenant (1)
播出时间：2017年1月24日
When an East End father and son are killed in a shocking road accident, Nikki and Jack find themselves working alongside a police officer with a vendetta. Clarissa summons her husband Max, a digital forensics expert, to help crack the case - and uncovers disturbing video evidence.
第 8 集 Covenant (2)
播出时间：2017年1月25日
Nikki helps Becky come to terms with her trauma. Jack is paranoid that Clarissa will leave the Lyell Centre. Paul is in way over his head.
第 9 集 Awakening (1)
播出时间：2017年1月31日
Nikki travels to Mexico following the disappearance of Lyell Centre intern Luisa in a suspected carjacking. After realising that the police are making little to no effort to find Luisa's body, Nikki teams up with project manager Dr. Eva Vasquez in an attempt to finally discover the truth. Back home, Thomas decides to send Jack to Mexico with one strict instruction - to bring Nikki home safely. However, he soon finds himself drawn into the case as Nikki and Eva find a mass grave containing six bodies. As Federal Police capture a cartel leader known as 'The Vulture' for his suspected involvement in the mass murders, Eva receives a stern warning to stay away from the case. And when Nikki later disappears, Jack realises she could be the next victim.
第 10 集 Awakening (2)
播出时间：2017年2月1日
A frantic Jack carries out forensic examinations on the spot where Nikki disappeared. With Thomas at the airport ready to come out and help, but still 24 hours away and no leads left to follow, Jack receives a text message containing a mysterious phone number. However when Jack calls through, expecting to hear from Nikki's captors, he is shocked at who answers the phone.
