Matt Hamilton

In the season four premiere, Oliver and Felicity must return home to help the team against attacks by "ghost" assassins led by Damien Darhk (Neal McDonough).

Leo, the owner of the restaurant Maggie and Henry visited, was shot by a robber and later died in the hospital. Maggie, who had heard about the previous robbery, suspected that Leo's death was a homicide and began investigating people around him with Henry.

Angie's home life is about to change forever as she comes to grips with her son Manny heading off to college. But there's little time to reflect on her new empty-nester status as a brutal crime focuses her attention on another young man. While investigating the murder of a teenage boy, Angie's past comes back to haunt her in the form of the homicide that inspired her interest in police work. Navigating a maze of red herrings and investigative dead ends, it takes all of Angie's experience and training to right the wrongs of the past as she races against time to catch a killer before he kills again.