When she sees a large map where students put their photographs where they're going to college, Marisa bursts into tears and smashes the bottle on the map. Meanwhile, Kelly arrives to the wild senior party but seems unenthusiastic about it. Annie decides to stop worrying about her friends and focus on herself, and decides to go to the party anyway. She picks up her crush, Phil, and they figure out where the party is by calling liquor stores in town to find out which one delivered the booze to the party and get the address. As they drive, they speed past Trent and Johnny, who come after them. Annie panics and slams the gas, turning things into a police chase. Marisa arrives to the party and looks for Annie, but Kelly confronts her. Kelly calls Marisa out for always refusing to give her a chance to talk to them, and reveals that she never wanted to end their friendship; after Marisa's parents divorced and she had to move away for a year, Marisa is the one who stopped speaking to Kelly because Marisa assumed Kelly wouldn't be there for her. Kelly says that she's not the one who changed - Marisa is. Annie and Phil end up crashing the car right into the party. Marisa and Kelly run out with the other students, and Annie, filled with confidence, calls them over. The three girls finally make up and hug. Trent and Johnny drive up, revealing that Andy spilled the beans on the location of the party, and Trent announces everyone at the party is under arrest. Sarah suddenly appears and reveals that the house belongs to Councilwoman Bohner, and threatens to put a bad word about Trent in if he disrupts the party. Warner, a teacher attending the party, reveals he went to school with Trent, and that Trent took a dump in the Jacuzzi during their own senior party. All the teens begin mocking Trent, causing him to lose his cool and storm off, and the party resumes. After the party, Annie, Marisa, and Kelly sit together on top of Annie's car, happy now that they are friends again. They all reveal they have not opened their college acceptance letters, and finally honor the promise they made four years ago and open the letters together. The film ends before it is revealed what each letter says. In December 2015, it was announced Jennette McCurdy, Kiersey Clemons and Virginia Gardner would lead the ensemble cast in the film, with Nick Kreiss making his directorial debut from his own original screenplay.