Two years after the events of the previous film, Skye Rotter is moving out of her boyfriend, Brigg Jenner and his family's house to New York City for college with her new friend, the free spirited Sienna Brooks whom she met on Craigslist. As she is on the road, Skye receives a call from her estranged sister, Alex Bell, who Skye has not spoken to in the past two years. Alex is surprised that Skye wasn't going to tell her that she was leaving. She begs Skye to come see her at her grandparent's country house to say goodbye before she leaves. Initially, Skye refuses, but is convinced by Sienna to tie up all loose ends before moving on with her life. Upon arriving back in Mill Basin, Skye and Sienna are greeted by Nathan Stillo, a 22-year-old man who shows them the way to Alex's after getting lost. At Alex's grandparents house (Bell Manor), Nathan is asked to immediately leave the estate by two of Alex's guests: Leo Fincher, Alex's love interest, and Nico Velli, who is ready to have fun no matter what. Skye goes inside to find Alex. Alex reveals that today is actually her "Sweet 16".