Young Woman is an unidentified young woman.
During an investigation by Donald Mallard and Eleanor Bishop at the then-missing Angus Clarke's office in the United Kingdom, the woman burst out of a side door to the office in black underwear, and proceeded to flee. Eleanor Bishop then proceeded to give chase, with both NCIS agents also fearing that her presence meant that Angus Clarke, who was married, was having an extramarital affair due to his marriage being on the rocks.
This suspicion was further fueled when Bishop questioned her, where she claimed that she was allowed to "crash" at Clarke's office by him after she was kicked out due to there only being one bed, and that she worked at the place. However, it was later revealed that she was really part of a sex-prostitution trafficking ring helmed by Gareth Godfrey, who was secretly an infamous Albanian mafia kingpin, with Clarke having been forced to let him use his office as a relay point for the ring under the threat of Godfrey and his minions murdering his wife if he refused.