Three days have passed since the Ken, with the help of the remote-controlled Ferox soldiers, killed countless Altruan. Three days since Tris' parents died. Three days since she herself shot her friend Will - and out of shame and horror, she remains silent. With the surviving Altruan, Tris and Tobias have fled to the Amite - but they are not safe there, as the war between the factions has only just begun. Once again, Tris must determine where she belongs - even if it means standing against those she loves the most...