Where did we go

When 13 year old Valentina's best friend Sterling meets a boy online and starts talking to him, Valentina worries for her friends safety and makes sure to watch what happens.
When the boy wants to meet both of them Sterling is ecstatic, Valentina is still worried but won't let her friend go alone.
So she joins her friend and finds something much different than what sterling was expecting.
They went missing at 13.
Almost 3 years pass before the FBI gets a lead on the case that had gone cold.
Will they save the girls from whoever took them?
Or will it be too late?
What happened to the girls in those three years. Will they ever be the same?