Bringing ISIS to justice for war crimes against Yazidis
Nadia
(CNN)  Nadia  was just 15 when ISIS fighters swarmed into  her  homeland.  She  says  she  was kidnapped  bought and sold by men who told  her  they owned  her   and repeatedly raped by them.
Three years on  the traumatized Yazidi is finally free of  her  captors  but remains trapped in a living nightmare  fearing the ISIS militants could still get to  her   or worse  kill members of  her  family.
The frail 18-year-old former slave doesn't even know if  her  mother  father and brother are still alive.
At a meeting in the Kurdistan region of Iraq   she  hides behind  her  cousin  one hand clenching  her  relative's shirt  the other holding tight to  her  own dress. Shell-shocked   she  cannot remember how many younger siblings  she  has  and struggles to recall their names.
 Nadia  was kidnapped by ISIS fighters who took over  her  Yazidi homeland when  she  was 15.
Nadia (not  her  real name) was among thousands of Yazidis captured by ISIS in August 2014 when the terror group launched an assault on Sinjar  then home to more than half a million members of this minority group.
 Nadia  and and  her  older sister Amira were separated from the rest of the family.  Their  mother was pregnant at the time  and  Nadia  doesn't know where she - or her baby - is now.
It was here   Nadia  says  that  she  witnessed an incident that still haunts  her : ISIS militants took a child away from his mother as  she  screamed for him.  Her  captors responded by hitting  her  on the head.  Nadia  still doesn't know what happened to the pair at the hands of the terrorists.
"They would tell us we sold you  we bought you "  she  says. "There were days we would wish we would die so no one says they sold us ... Beating and everything else is bearable  but not selling."
An Iraqi Kurdish investigator who asked to be identified as Shaima has heard stories like Nadia's dozens of times as she interviews freed Yazidis. "Some of them are eager to tell their story. Some of them are reluctant because they can't go into the details -- it's difficult for them " she says.
From Mosul   Nadia  and  her  sister were taken to Syria  where  Nadia  spent a year being moved between Homs  Tabqa  ISIS' self-declared capital  Raqqa  and Deir Ezzor.
 Nadia  says  her  sister Amira killed herself after she was forced to "marry" an ISIS fighter.
 Nadia  says  she  was repeatedly raped at the hands of  her  kidnappers.  Her  sister killed herself in captivity.
After her suicide   Nadia  says she was determined to get away. She and some other Yazidi captives tied their headscarves together to form a rope they used to climb out of the house where they were being held captive.
Sold to a Syrian ISIS fighter   Nadia  says  she  became pregnant; to avoid having a child conceived by rape   she  threw  herself  from walls and took pills to terminate the pregnancy.
"I did not want it  what else could I do?"  she  asks.
(CNN)  [TGT]was just 15 when ISIS fighters swarmed into  [TGT]  homeland.  [TGT]  says  [TGT]  was kidnapped  bought and sold by men who told  [TGT]  they owned  [TGT]   and repeatedly raped by them.
Three years on  the traumatized Yazidi is finally free of  her  captors  but remains trapped in a living nightmare  fearing the ISIS militants could still get to  her   or worse  kill members of  her  family.
The frail 18-year-old former slave doesn't even know if  her  mother  father and brother are still alive.
At a meeting in the Kurdistan region of Iraq   she  hides behind  her  cousin  one hand clenching  her  relative's shirt  the other holding tight to  her  own dress. Shell-shocked   she  cannot remember how many younger siblings  she  has  and struggles to recall their names.
 [TGT]was kidnapped by ISIS fighters who took over  [TGT]  Yazidi homeland when  [TGT]  was 15.
[TGT] was among thousands of Yazidis captured by ISIS in August 2014 when the terror group launched an assault on Sinjar  then home to more than half a million members of this minority group.
 [TGT]and and  [TGT]  older sister Amira were separated from the rest of the family.  [TGT]  mother was pregnant at the time  and  [TGT]doesn't know where she - or her baby - is now.
It was here   [TGT]says  that  [TGT]  witnessed an incident that still haunts  [TGT] : ISIS militants took a child away from his mother as  she  screamed for him.  Her  captors responded by hitting  her  on the head.  [TGT]still doesn't know what happened to the pair at the hands of the terrorists.
"They would tell us we sold you  we bought you "  [TGT]  says. "There were days we would wish we would die so no one says they sold us ... Beating and everything else is bearable  but not selling."
An Iraqi Kurdish investigator who asked to be identified as Shaima has heard stories like [TGT]'s dozens of times as she interviews freed Yazidis. "Some of them are eager to tell their story. Some of them are reluctant because they can't go into the details -- it's difficult for them " she says.
From Mosul   Nadia  and  her  sister were taken to Syria  where  [TGT]spent a year being moved between Homs  Tabqa  ISIS' self-declared capital  Raqqa  and Deir Ezzor.
 [TGT]says  [TGT]  sister Amira killed herself after she was forced to "marry" an ISIS fighter.
 [TGT]says  [TGT]  was repeatedly raped at the hands of  [TGT]  kidnappers.  Her  sister killed herself in captivity.
After her suicide   Nadia  says she was determined to get away. She and some other Yazidi captives tied their headscarves together to form a rope they used to climb out of the house where they were being held captive.
Sold to a Syrian ISIS fighter   [TGT]says  [TGT]  became pregnant; to avoid having a child conceived by rape   [TGT]  threw  herself  from walls and took pills to terminate the pregnancy.
"I did not want it  what else could I do?"  she  asks.