Counterpart (2017) is an American sci-fi thriller in which the earth becomes 2.
In one of the 2 worlds a terrorist cell sets up a boarding school to train children as 'soldiers'.
Some of the children are orphans, others have been handed over willingly by their parents.
There is also Nadia (Sara Serraiocco), a girl who was in foster care who becomes an assasin in one world, and a violinist in the other.
Much of the conversation is about the different directions we take in life, our 'shadow' sides (following Carl Jung), and how we can be influenced by nationalist agendas.