Perabo plays Annie Walker, a CIA agent sent to do field work for the Domestic Protection Division. Her handler, Auggie who is blind, is played by Christopher Gorham. Season five introduces Ryan McQuaid played by Nicholas Bishop. On McQuaid’s character:
He seems like a bad guy and then Annie starts to think he’s a good guy. Because of how high level this is… you definitely don’t know who the bad guy is… I think it makes the whole thing really dangerous, really exciting — who you tell the secrets to, who knows where you really are.