What should a country do when a citizen leaves to join a terrorist group overseas, then wants to return home? That debate has taken a turn in the United Kingdom. Shamima Begum left Britain at age 15 and joined ISIS in Syria. Last year, she was discovered in a refugee camp there and appealed to come home. But the British government revoked her citizenship. This week, a British court ruled that Shamima Begum can return home to challenge the government’s decision. The World’s Carol Hills speaks with Azadeh Moaveni, an Iranian American journalist and author who has written about women who have left their home countries to join ISIS.