Three years after they started dating, Hallie and Owen reunite with their respective friends Willa and Matt at a house party in Malibu. Owen and Hallie spent the first half of their twenties together, and now they are hitting a wall. Just as they decide to take a break, their friends Matt and Willa embark on an unexpected romance of their own. The two couples' fates intertwine over the course of a single summer.