What is the order of the shadow children books?

The books are about shadow children. Shadow children are third child and they are forbidden from the population police. They can't have more than two children. And Luke, the main character, is a third child and he meets people and starts to change himself and takes adventure. I read the book and it's very good

The series goes:

Among the hidden

Among the Impostors

Among the betrayed

Among the barons

Among the brave

Among the enemy

Among the free