Suffering a hangover from a graduation party, eighteen-year-old Whitley is blindsided by the news that her father has moved into a house with his fiancee, her thirteen-year-old daughter Bailey, and her son Nathan, in whose bed Whitley had awakened that morning.

Lily has lived with her mom since her parents got divorced several years ago, and her dad has recently remarried to a woman with a daughter her age named Hannah. But now, Lily's mom has gotten a once-in-a-lifetime work opportunity in Africa and she'll be gone for a year, so Lily is moving in with her dad-and new stepmom and new stepsister. It'll be as easy as apple pie, right? Wrong. Lily promises her dad that she'll try to get along with everyone,...