The house (Divergence Part 1)

Maryanne's society has been divided up into 5 factions. Abnegation, Erudite, Amity Candor and Dauntless, When children turn 16, they must choose where they belong,
Maryanne has a tough time choosing, then, she finds out her best friend is divergent and everything changes.
Her whole life depends on her Best Friend and she's taking every risk to help her.