back in dohuk, we visit the kurdish government's office for kidnapped affairs. inside, staff process the files of the missing. some get liberated by the army, others by paid smugglers. they charge up to 30,000 euros a mission. it's a controversial business. sometimes the government pays directly. more often, family members have to come up with the money themselves. but critics say it's not always clear where the cash goes. 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

. >> we're visiting refugee camps dotted around the province of dohuk in northern iraq. hundreds of thousands of yazidis have fled to this kurdish region to escape the so-called islamic state. this camp, called sharia, provides refuge to yazidi women and their children. sewing courses offer a welcome diversion, at least for a few hours. we tatalk to susanne. she escaped with her four children just a few months ago. other family members are still missing. while in captivity, susanne was raped repeatedly. >> they were disgusting -- so dirty, with matted hair, dirty weapons, barefoot, sometimes with just one arm. we were a group of 25 women. they sold us to the fighters. i tried to kill myself, but it didn't work. >> for the past two and half years, german-kurdish psychotherapist jan kizilhan has come to northern iraq regularly to visit the refugees. >> the psychiatric problems have gotten much, much worse. many of the refugees are severely traumatized. they've been mistreated and raped for three years. women in particular and young children who've been forced to fight just