"Rosaline" is a comedic twist on Shakespeare's "Romeo and Juliet" in which the classic love story is told from the perspective of Juliet's cousin Rosaline (Kaitlyn Dever), who just happens to be Romeo's recent ex-girlfriend. Crushed when Romeo (Kyle Allen) dumps her after meeting Juliet (Isabela Merced), sharp but idealistic Rosaline schemes to foil the famous romance and win back her guy.