Sons of the Serpent, three vantage pointsPersons of Interest gives the Sons' founding trauma (Tariq Al-Masri, radicalized by a water-diversion catastrophe). 'Blood Price' shows them wanting a defector engineer for propaganda. 'False Flag' shows them framed for a bombing they didn't plan. Three stories, one faction, and enough daylight between the canon motive and how outsiders describe them to build a whole arc out of the gap.