we're meeting abdullah sherew. 56 of his relatives were kidnapped by i.s. he paid for six of them to be freed. after that, he set up his own network of smugglers to free hostages. >> we contact many who live in areas under i.s. control. there are phases where the smugglers live in raqqa. we have smugglers who cross the border, and we have another group that brings the hostages here. >> sara is among those who were freed with his help. her own attempts to escape failed again and again. when she tried to flee for the third time, her captor took what was most dear to her -- he poisoned her children. the i.s. militants then displayed the bodies of her three dead children on a big screen. >> i cried and said, "you have enslaved us, you have taken away our husbands, why murder our children?" and he said, "they are children of kuffar, the unbelievers." my daughter was five, my son a year and seven months, and the youngest wasn't even 40 days old. >> abdullah has so far rescued 312 women. every mission is extremely dangerous, both for the smugglers and the hostages