Not only were they previously CIA operatives themselves, but they’re also more than happy to help their old friend collect information on dangerous Russian mob bosses so that he can complete his personal mission.
Over the course of the movie, we see that Susan and Brian Plummer wind up being a part of both parts of McCall’s life.
In the first Equalizer, audiences were introduced to Denzel Washington’s Robert McCall, a retired CIA black ops operative who has the good quality of having a hard time ignoring calls for help.