Plot
Rigsy contacts the Twelfth Doctor and Clara for help. He shows them a number tattoo on his neck, counting down, with no memory of how he got it nor events of the last day. They trace his movements to a trap street in present-day London that houses extraterrestrial refugees, using telepathic alien worms to appear as human to the Doctor, Clara, and Rigsy.
Me, [N 1] the immortal mayor of the trap street, explains that she sentenced Rigsy to death after he was accused of murdering Anah, a two-face Janus. They gave him a Chronolock: a tattoo which counts down with each passing minute. When it reaches zero, a Quantum Shade (a being that takes the form of a raven) is summoned to kill him. However, they also had to give Rigsy an amnesia drug to forget the trap street's existence. Me allows the Doctor and Clara to prove Rigsy's innocence. Clara learns that the Chronolock can be transferred to another willingly. Believing Me will not let her die, Clara takes Rigsy's Chronolock without the Doctor's knowledge to buy them more time.
The trio meet Anah's psychic daughter, Anahson, and learn that Me used Rigsy to bring the Doctor to the trap street and that Me is afraid of someone Anahson cannot identify. The Doctor realises from the medical data in the stasis pod Anah is stored inside that Anah is still alive, and Anah is locked in by a device compatible with the TARDIS key. However, when the Doctor uses his key, the lock device clamps a metal ring around his wrist and takes the TARDIS key. The band is a teleportation device to send the Doctor far away to keep the street safe from attack by unnamed people Me made a deal with. Me demands the Doctor's Confession Dial. Me then goes to remove the Chronolock from Rigsy only to discover Clara had taken it; Clara broke the contract Me had made with the Shade and she cannot undo it. The Doctor becomes angry and threatens Me, demanding that she save Clara, but Clara calms him down, asking him not to be upset nor avenge her death. Clara says her goodbyes and then steps into the street to face the Shade before it kills her. Back in the house, the Doctor warns Me to keep away from him in future. Me then activates the band, sending the Doctor away.
Continuity
The Doctor once again consults his response cards, first seen in "Under the Lake", in "an effort to be nice" before breaking the news to Rigsy of his impending death. [1]
Rigsy is injected with Retcon, a substance introduced in the Doctor Who spinoff, Torchwood , to cause those that take it to lose their memory of meeting members of Torchwood and having alien encounters. [2]
Among the disguised aliens living on the trap street are a Sontaran, Judoon, an Ice Warrior and an Ood caring for a Cyberman. [3]
Me asks the Doctor for his confession dial, first seen in "The Magician's Apprentice" and retrieved by the Doctor in "The Witch's Familiar". [4] [5]
Clara mentions her deceased lover Danny Pink, saying that if he could face death (as he did in "Death in Heaven"), then so can she. [6]
As Clara entreats the Doctor not to take revenge on Ashildr, she tells him "don't be a warrior.... be a Doctor". This is the same plea she made to the Eleventh Doctor when he planned to destroy Gallifrey to end the Time War in "The Day of the Doctor". [7]
Outside references
Clara mentions having a romantic relationship with writer Jane Austen. In "The Magician's Apprentice", she even calls her "a great kisser". Earlier in "The Caretaker", the Doctor disputes with Clara about when Austen wrote Pride and Prejudice . [7]
As they prepare to investigate, Clara suggests that she and the Doctor employ the good cop/bad cop interrogation method, with her as the 'good' cop. When the Doctor asks why he can't play 'good cop', Clara says that his face won't allow him. [8] [9]
