Jay Sullivan is an agent with the Falcons.
That unusually named organization is part of the British government, a very secret part that answered to just the upper echelon with the sole purpose of eliminating problems. Not all solutions involved the sort of work that Sullivan was especially good at, however, though most seemed to.
Sullivan was, to be more specific, a trained assassin, a man who has the ability to kill quietly or in a spectacular manner depending on the orders with a myriad of instruments or make it look like an accident or suicide, again whatever his instructions are. He was very qualified with firearms though he almost never carried one. "He didn't consider them useful. He believed a true fighter should be able to use his environment, to manipulate resources to his will. Why would you need a gun when you can cup a man's eyeball out with a teaspoon?" Sullivan, the iced-blooded killer, is not a very nice man.
But is also the single father of Talia, a lovely 12-years old girl, the one thing on this planet that he loves and the one thing for which he would, if necessary, die for although if given a chance, he would rather kill for.
At least that is the situation when we first meet him but that will change in a horrible way shortly after our introduction. That is when Sullivan successfully completes an assignment and a Russian senator finds his life ending abruptly. Unfortunately he had been given the wrong name and now his handlers are in a bind. To cover their behinds, they elect to blame Sullivan for a mistake he did not make and sent another assassin to seal the frame by eliminating the framed. When that does not go off as hoped, Sullivan sees his Talia being carried away.
The adventures we have of Sullivan will then be his dealing with his grief and his frustration at constant failings to locate his daughter, invariably followed by mind-numbing alcoholic binges. And on occasions, the need will come for someone with his unique skillset, whether it is to protect innocents or to punish malefactors or both - assuming that Sullivan can find a way to sober up enough to get the job done.