Danny Watts is a sometime agent for MI6.
Sometime meaning here that he is not an actual operative but does do an occasional little thing for them, their attitude it seems, which nearly gets him killed. This is the same MI6 that tried initially to kill his grandfather and since Watts was with him at them time, kill Watts as well.
When we first meet Watts he is 17 years old. The overall title for the series is 'Boy Soldier' though that is a tad misleading since Watts is 17 when the first recorded adventure takes place. We learn straight off that he has had dreams of becoming a soldier for some time and in our introduction to him he is taking part in a selection process for a bursary (scholarship) to get to university and then, hopefully, Sandhurst Military Academy.
Technically an orphan since his parents were killed a decade before, Watts is a resident of Foxcroft, "a privately run hostel for teenagers". He has been there for that last five years, dreaming of growing up enough to fulfill his military plans.
At 5'10 with a slim build with a skill in cross country racing, Watts is physically well qualified for his desired career and though his academic studies are not top of the line, they are nevertheless good enough to not be a hindrance. What will be the big obstacle which he will face comes to him out of the blue when he learns that it is his grandfather who will be the cause of his rejection.
Fergus Watts was an SAS veteran seconded to MI6 for a very special and very sensitive mission to Columbia going against the cartels when he supposedly turned traitor for money, completely bolluxed the ongoing operation, and got himself thrown into that South American prison. His reputation then being totally shot, that ignominy got extended to the younger Watts.
The first two adventures will deal with the 'resurrection' of Fergus and the work by he and Danny Watts to find the real traitor and clear the family name. The next two will be the times that Watts will be sometime agent once his name is no longer said with a snarl. Well, technically I think the last mission was more for MI5 than MI6 but perhaps that is quibbling.
Assisting the Watts for the first two matters and then working side-ty-side with Watts in the last two is Elena Omolodon, a close friend of Watts from his Foxcroft days and a computer whiz who will prove immensely valuable to the two Watts during their struggles. She will also prove to be even closer to Watts as time goes by.