Jack Storm is an agent with the CIS.
That, of course, is the Canadian Intelligence Service, a clandestine government department responsible for carrying out the actions needed or desired by the powers-that-be which are best not told about to the general public.
As the series name for the adventures we have of Storm so far states, he is 'the Extractor' which in special operations lingo means that it falls to him to go into hostile territory and find a way to bring an asset or a fellow operative or even once in a while an adversary out of that area and back to wherever his bosses tell him. Storm has been doing this kind of work for some time and he has proven to be exceptionally good at it.
When we first meet Storm, it is in a flashback taking place three months before the main action and Storm is in a horrible situation. It falls to him to find a way to extract his wife, Agnes, and four-year-old daughter, Victoria, out of Denmark where they had been on vacation before, as she put it, "they came for us, even though this wasn't [his] mission". The 'they' in this instance were Islamic terrorists more than a little upset with Storm, his wife, and other members of his CIS team. He is successful but then tragedy struck soon after and the Cessna carrying his family to safety disappears.
Which explains much of what Storm does in the adventures which follow. He is 'celebrating' having gone the last month sober. He has improved his already very good physical condition because exercise is a way to get his mind off his sorrow. Such things as haircuts and shaving are not as important, however. Eating is also almost an after-thought. His bank account is nearly empty and his home already sold, all to finance the search he has done over the North Sea in the certainty that his loved ones were not dead, only lost.
This is the Jack Storm that the CIS will be forced by circumstances to pull back into action because of the near impossible nature of the missions. It is a Jack Storm that is not quite sure whether living to make it out of the assignment is even that important anymore.