every 16 yr old is going through the choosing ceremony to see there new faction
beatrice learns she is divergent and struggles with it thoughout the story
Beatrice decides to join dauntless at the choosing ceremony. She changes her name to tris
Tris completes Dauntless initiation and is injected with a new serum.the serum causes the dauntless members attack Abnegation. Tris and tobias are not affected because they are divergent after attempting to save her family . they are captured
The three of them break into the dauntless compound and save tobias. Her father dies while they while trying to take on all the guards
tris and her allies leave the Dauntless compound and flee by train to amity. This is only the begging!