阿曼达（莱丝莉·比伯 Leslie Bibb 饰）刚刚结束了一段失败的婚姻，前夫留给她的，除了一段伤心的过往外，还有两个需要抚养的孩子。带着两个孩子，阿曼达回到了阔别已久的故乡达拉斯，这个风景如画的地方如今建立了大片的社区，成为了富人们安家置业的首选。而聪敏的阿曼达回乡没多久便发现，这个看上去干净整洁精致的社区里，其实隐藏了无数的乌烟瘴气的阴谋和背叛。
虽然阿曼达看起来谦和有礼，和可谁知道在高中时代，她曾经是校园里人人避之而不及的不良少女，不少女生都是她欺负的对象。如今，这些女孩都已经长大成人拥有了各自的家庭，阿曼达的回归对于她们来说，是悲剧的重演还是复仇的良机？

Justin Long and Emmy Rossum are star-crossed lovers whose relationship blooms and unravels over the course of six years in this mysterious, dazzlingly original romance. When a chance encounter brings together the cynical Dell (Long) and the quick-witted Kimberly (Rossum), the stage is set for a tempestuous love affair that unfolds like a puzzle. As the film zigzags back and forth in time-from a meteor shower in LA, to an encounter in a Paris hotel room, to a fateful phone call-an unforgettable portrait of a relationship emerges. Sumptuously shot and boasting incredible chemistry between the leads, Comet is a one-of-a-kind cosmic love story.