Joe's bromance with Oisin continues to bloom, much to the chagrin of his close friends. Maddi's feeling toward Trevor get thrown for a loop when Mikel reveals shocking information from Trevor's night out. The group comes together for Grace Lilly's birthday bash, but when Oisin drops a major bombshell about an alleged hookup from boys night, things quickly take a turn for the worse. Will and Emmy question the loyalty of their closest friends.