Trap Street , London " Trap Street " was a name used by Clara Oswald to refer to an alien refugee camp which existed in London from the 19th century through to at least the 21st century . Culture . The trap street was under the jurisdiction of the immortal human Ashildr , working as mayor of the camp under her alias " Me " . Hidden from public notice by a misdirection circuit , it existed at the heart of central London . The entrance was a narrow passageway located between two buildings on a major street in the city . The trap street strongly resembled a 19th century streetscape . The street provided refuge and sanctuary for a variety of alien species - the Twelfth Doctor was able to identify at least " 27 different species on [ the ] street . . . 15 of whom [ were ] known for aggression . " Despite the presence of individuals from war - like races such as Sontaran s and Cybermen , no conflict was permitted on the street ; at the time of the Doctor ' s first visit , there hadn ' t been a single act of violence on the street during the last century . The law of the street was very strict ; crimes such as murder or theft were punishable by death , a sentence handed down by Ashildr and enforced by a Quantum Shade with which she had made an alliance . Upon entering the street , individuals would be captured by a force field so that the residents of the street could assess them ; any human s who had inadvertently entered the street , or any aliens whose claims for santuary were deemed insufficient , would be dosed with Retcon to erase their short - term memory and ejected from the street . Clara derived her title for the street from the cartography practise of trap street s . ( TV : " Face the Raven " ) History . Ashildr came to reside on the trap street around the time of the battle of Waterloo . She became the street ' s mayor . In the early 21st century , Rigsy was summoned to the street via a call to his mobile phone ; once there , he was framed for the supposed murder of Anah . Sentenced to death by Ashildr , a chronolock was placed on him , and his memory was erased . Waking the next morning and remembering nothing of the previous day ' s events , Rigsy contacted Clara Oswald to ask her help in uncovering the source of his " new tattoo " . The Twelfth Doctor , accompanying Clara and Rigsy , was able to track down the trap street in spite of its misdirection circuit . Once they had entered the street , the Doctor and Clara focussed on investigating the truth behind Anah ' s murder ; Clara , unbeknownst to the Doctor , encouraged Rigsy to pass the chronolock on to her . This mistake would later lead to her death . With the help of Anahson , the Doctor discerned that Anah was not actually dead - the entire crime had been fabricated as part of a ploy by Ashildr , who had previously made a deal with the Time Lord s to capture the Doctor in exchange for the continuing safety of the street . After Clara was killed by the Quantum Shade , the Doctor was transported away from the street by means of a teleport bracelet . ( TV : " Face the Raven " ) After escaping his confession dial and arriving on Gallifrey , the Doctor had the Time Lords use an extraction chamber to remove Clara from her timeline the moment of her death on the trap street . It left her body processes frozen between one heartbeat and the next , but ultimately , Clara ' s death was a fixed point in time ; she would have to return to Gallifrey , and then be returned to her own timeline , or risk damaging the very fabric of the universe . After stealing her own TARDIS , and picking up the still - living Ashildr from the end of the universe , Clara confirmed that the Time Lords could return her to the moment of her death on the trap street . However , as she was theoretically immortal due to the nature of her current condition , Clara decided to return to Gallifrey and thus her death on trap street " the long way around " , and first set off for more adventures with Ashildir in her own TARDIS . ( TV : " Hell Bent " )