The Big One is coming. The girls fear a potential major earthquake hitting Los Angeles, while Jules fears a different “Big One”: running into your ex with a new girl. Stella rebels against Madison’s need to control her friends’ lives during an outing to SantaCon.

On the heels of Madison and Jules’s blow up, all four girls end up in Mexico for a wedding weekend gone wrong: secrets are revealed, hallucinogenic drugs are taken, and Jules’ commitment to her girlfriends faces the ultimate test.