Tom Marlowe is an agent with MI5.
More specifically, he is attached to "Section D".
That is a "small, off-the-books department of MI5" with much coveted (and envied) close links to Whitehall. It is known, well as much as anyone not in Section D is allowed to know, for having some very, very impressive cyber talent with the ability to get into just about anyone's servers while avidly keeping its own computers safe from hacking. Some naysayers like to opine that the "D" stands for "Disavowed" but no one told the Prime Minister who is a frequent user of the talents of that Section.
Marlowe comes to MI5 via his mother who had been a senior field operative in charge of a small department and her best friend, his 'Aunt" Emilia, also an operative and the one who eventually pull Marlowe away from his still-new career as a Royal Marine Commando to join MI5. His mother had been on one of the trains on 7/7 2005 trying to stop one of the bombers on that fateful day; she lost her life in that failed attempt.
We first meet Marlowe, after a prologue describing one of his very first field operations in which he finds it necessary to eliminate several white supremacists in order to save the life of his mentor, as he is recovering from injuries received while on an off-the-books mission transferring a prisoner "who didn't exist on record" and who was freed with the help of a rat somewhere in MI5. We quickly learn from the conversation he has with the psychiatrist with the authority to authorize his return to active service that even though he is technically part of MI5, most of MI5 do not concur.
Marlowe is an exceptionally good operative with a great nose for trouble and the skills to get out of it alive, albeit with a lot of scars to show for it. He is also prone to annoying higher-ups because he has never quite got the knack for playing along; he speaks his mind which means he often irks those who do not like the truth played back at them. Several of those would have gotten rid of him completely (and perhaps permanently) if he were not so darned good at what he does.
Good Lines:
- Said by a mentor to Marlowe regarding that man being so set in his ways: "Pick what you like and never deviate. Change is dangerous. Change leads to chaos."