The series stars Nathan Phillips (Wolf Creek) as Flynn, a headstrong Baltimore FBI agent with a dark past trying to piece together the disappearance of his wife. Britne Oldford (American Horror Story) will play Regan, who is one of the government's most valuable operatives and may be keeping secrets of her own. Julian McMahon (Nip/Tuck) portrays McCarthy, an unhinged junkie and Hunter cell leader.