In the midst of enjoying their summer together, a young couple’s peaceful life is disrupted when Emily’s ex-boyfriend, Calvin, and his teenage half-sister, Lucy, unexpectedly arrive. As the four spend more time together, tensions rise as Emily and Calvin rekindle their romance, while Eric becomes infatuated with Lucy’s quiet nature and beauty. As the day progresses, their relationships become more complicated, leading to a dangerous love game filled with jealousy, lust, and shocking consequences that will change their lives forever.