Miles Halter enrols at Culver Creek Academy; on his first day, he gets a new nickname, a best friend and some enemies; he also makes a deal with Alaska Young that will change his life forever.

An expulsion ignites an escalating prank war with the Weekday Warriors as both sides try to discover who is "the rat" inside Culver Creek; Miles finds his future at the school at risk and his loyalty to his new friends tested.

Alaska sets Miles up on a triple-and-a-half date that doesn't go as planned, while a fragile truce with the Weekday Warriors proves short-lived.

Despite his friends' warnings, Miles agrees to spend Thanksgiving with Alaska at Culver Creek, but a trip to the Colonel's home for the holiday only leaves the group further apart.

After the Weekday Warriors go too far, Miles, Takumi, the Colonel and Alaska decide to reunite for revenge; following a wine-soaked game of Best Day/Worst Day, new secrets are revealed and a new romance blossoms.

The Colonel faces the consequences of his actions; Miles and Alaska find themselves closer than ever.