The fall of Bashar al-Assad marked the historic end of more than 50 years of cruel tyranny that began with his father Hafez, who took power in 1970. The world watched moving scenes of Syrians being freed from the regime's dungeons after a 13-year-long civil war killed hundreds of thousands of people. But who are Syria's new leaders? Who are the rebels that toppled Assad? In this episode, Sefa Secen, an expert on Syria and Middle East security, delves into the country's murky future and dark past.