最后一天

18岁的青年西蒙（加斯帕德·尤利尔 Gaspard Ulliel 饰）在回家的火车上邂逅了一位姑娘——露易丝（梅拉尼·罗兰 Mélanie Laurent 饰），他将后者带回家里。圣诞期间的家中气氛冷峻，父亲一如既往怀疑他的生活，而西蒙和姐姐依旧恶语相向。共处一室作息的西蒙和露易丝却没有亲昵行为，当西蒙将露易丝介绍给自己的朋友马修后，他在这段三人行的关系中感到了纠结与痛苦，露易丝和马修越走越近，而西蒙的失落在不断叠加。与此同时，母亲当年的情人再度出现，这令西蒙一家生活的裂痕愈发明显。当露易丝和马修都离开了西蒙，母亲又向他吐露了一个秘密……At Christmas time, 19 year old Simon returns home to visit his dysfunctional family with Louise, a fearless girl he met during his train ride. While Simon struggles to cope with the growing distance between him and his parents, he starts to examine his feelings when Louise develop a liaison of her own with his childhood friend Mathieu. As dark family secrets are uncovered, Simon begins to understand the truth about his sexual orientation.