Harry and Helen Tasker are agents with Omega Sector.
That is a top-secret American intelligence agency which operates out of a computer hardware manufactoring and sales company. Most of the employees of that corporation have no idea at all that in special sections of their large office building, the clandestine activities of the true organization take place. Omega Sector is run by a no-nonsense, very hard-to-please female Director named Spencer Trilby.
When we first meet them, Harry is a very experienced and quite capable operative and has been for nearly two decades. He is part of a honed team and is decidedly the leader, able to plan meticulous missions and then improvised on the spot when things go wrong as they always do in any intricate operation. A few years after he started with Omega Sector, he met and fell in love with Helen; they married and soon gave birth to a daughter named Dana and then a son named Jake.
Since all that Harry does is classified and his cover identity as a computer salesman had already been long established, he has continued the deception throughout their marriage. His frequent absences to go on missions around the world are explained to Helen and family as client visits and seminars and trade shows and the like.
These trips have put a strain on the marriage as Helen craves a lot more excitement in her marriage than just her job as a language teacher and raising two now teenagers large on her own. She puts some spark into it with becoming very skilled in a lot of different languages and in becoming highly proficient in martial arts. One word repeatedly used for her in various blurbs about their lives is 'unfulfilled'. Harry is always bringing her guide books for far off places she would love to see but never does because there is always one more mission/trade show for Harry to have to go to.
At least up until Helen learns the truth about Harry and Omega Sector sees how good she is at those languages and kicking butt and suddenly the two become a team.