Brigitte Sharp is an agent with MI6.
She went by Bridge with her online friends. Or Ponty. When she talked with fellow computer hackers online, she preferred to remain as anonymous as she could. She was careful about her identity after her teenage arrest for hacking. Now in college, she wanted to make shre she did not screw up her chances of graduating by getting caught hacking again. But then a classmate was handed a business card by some civil servant and she got curious who it was and started looking and the looking lead deeper and she was pretty good to not get caught - until she was.
MI6, or SIS, did not have her arrested. They just made sure she kept her nose clean until she got the diploma and then gave her a job. The department was called Cyber Threat Analytics (CTA), the brainchild of the head of the group. After the 7/7 London bombings, he, a fairly new SIS handler, had pointed out that MI6 was in need of its own cyber branch because if it had had one, it might have been able to stop the attack. Sure, MI5 was technically in charge of domestic intelligence gathering and GCHQ was considered the expert but MI6 needed in that field as well because "foreign knowledge and intel, if combined with the technical skills required to monitor and analyse digital comms, would place it in the best position to connect the dots between resident actors and their mentors abroad".
CTA needed bright people with computer skills and understanding of how things worked under the surface of the web, outside of normal social media and merchant commerce. Sharp fit in well, or as well as she could fit in anywhere. After training and a reasonable amount of apprenticeship she was offered a position of "Operator In Theatre", otherwise known as field work. She had a senior partner who called the shots but she was really, finally in the field.
Then came the mission codenamed Doorkicker, the op that she had been a part of that, in her opinion, she had messed up and the operation went very wrong and her partner died. The powers that be saw things a bit differently than she but since it was her confidence that was the deciding factor to when or if she ever went operational again, her doubt ruled.
When we meet her for the first time, it has been three years since the incident and while she'd made a lot of progress, she still didn't feel ready. She had been happy working as an OIT and wants very much to get back to it but even after all these many months she says she is "still in therapy. I'm not ready".
Considering she was being shoved back into the field again, she needs to get ready really quickly.