Divergent by Veronica Roth (Divergent #1)

Sixteen-year-old Tris has been forced to make a terrible choice. In a divided society where everyone must conform, Tris does not fit. So she ventures out, alone, determined to find out where she truly belongs. Tris can trust no one in this brutal new world, but she is drawn to a boy who seems to both threaten and protect her. Insurgent: Tris has survived a brutal attack on her home, but she has paid a terrible price. Wracked by grief and guilt, she becomes reckless as she struggles to accept her new future. If Tris wants to uncover the truth, she must be stronger than ever as more shocking choices and sacrifices lie ahead. Allegiant: The faction-based society that Tris once believed in is shattered - fractured by violence and power struggles and scarred by loss and betrayal.