" A House Divided " is widely considered one of the most intense hours of Person of Interest , serving as the first half of the seismic Season 3 finale. It’s the episode where the "Cold War" between the Machine and Samaritan officially boils over, forcing Team Machine into a desperate race against time.
Setting the stage for "Deus Ex Machina" and changing the show's DNA forever. Person of Interest 3x22
Control finally realizing she isn't the one in charge anymore. " A House Divided " is widely considered
