Eight friends, all in a stable relationship, decide to venture into a game of sexual discovery by exchanging couples while trying to free themselves from their daily routine and add a spicy touch to their love life....
As his mother’s illness progresses, a wealthy young man hires a perfect caregiver. But their lives start to spiral into a deadly affair as the caregiver seemingly tries to make herself a permanent facet of the wealthy family....
贝拉（克里斯汀•斯图尔特 Kristen Stewart 饰）即将毕业，她与爱德华（罗伯特•帕丁森 Robert Pattinson 饰）在婚姻问题尚有分歧。父亲总担心女儿跟爱德华交往会吃亏，但是爱德华保守派风格令他安心。雅各布（泰勒•洛特纳 Taylor Lautner 饰）看到爱德华与贝拉依旧如胶似漆，内心十分挣扎。他感应到贝拉对自己的感觉，并私下对她示爱。在强吻遭拒后，两人不欢而散。贝拉的衣物神秘被盗，同时爱丽丝感到昔日库伦家族的维多利亚正在准备为死去的詹姆斯复仇。后者组建了一支吸血鬼新生儿军团，正在赶往此地，来势汹汹，不可不防。于是，库伦家族决定积极备战。考虑到贝拉的安全，雅各布也决定加入，昔日宿敌结盟，联手对抗外来的恶势力。然而大战在即，贝拉却还纠缠在同爱德华和雅各布的感情之间，难以抉择……...
