Ron Granger is a former agent with the CIA.
Valerie Granger is a former Mossad agent.
Leecy Granger is their teenage daughter nearing maturity.
Together the three make up the Granger family who have their lives nicely the way they want it. And then reality comes knocking with problems out of their past and the two elder Grangers find returning to their old skills is the only want to keep alive. As a result, both Ron and Valerie allow themselves to be courted by the Agency and even the younger Leecy will be brought in as well.
When we first meet them, literally and figuratively on the first page, they are the victims of a late night invasion by black-hooded assailants with guns. Adversity, they say, shows character and the character this trouble demonstrates clearly point out that you should not mess with either of them - ever. Awakened from a sound sleep, Ron and Valerie waste no time with confusion or indecision. Ron incapacitates the nearest man and tosses that person's gun to his wife who heads into the hallway to confront the second who is using teenage Leecy as a shield and threatening to kill her. Valerie calmly and clearly makes the simple offer, "Let her go and I won't kill you."
No hesitation and no quarter. The man does not release Leecy and Valerie, after giving him a "last chance to leave here alive", puts a bullet over Leecy's shoulder into the man's forehead. Neither Ron and Valerie waste time. Ever.
Ron Granger is 46 years old when the recorded adventures begin. Valerie is a year or two younger. Both had been, as mentioned, agents but had given up field work five years earlier to make a "normal" life for themselves and their daughter. Up until the invasion, Leecy did not know of her parents' employment history but like her stoic parents, she adapts very well.
After the break-in, the days of all three Granger's living a quiet suburban existence ends and their days in the field resume. Even Leecy.