The series follows Rebecca "Becca" Winstone (Ashley Judd), a now-retired CIA agent raising her son, Michael (Nick Eversman). Ten years earlier in 2001, Becca's husband Paul Winstone (Sean Bean), who was also working for the CIA, was killed in a car bombing that Michael was able to avoid, caused by Russian intelligence. Michael, now age 18, informs his mother that he has been accepted to a summer architecture program, in Rome, Italy. Becca, who now lives a normal life running a florist shop, is hesitant to let him go, though she sees that her son has grown up. After not hearing from him for over week and receiving a call informing her that Michael has moved out of his dorm room, Becca takes it upon herself to travel to Europe and track down her son, using every means necessary to locate Michael