故事的主角是一个沉默的独行杀手（Isaach De Bankolé 饰），他永远只点两杯咖啡，在无聊的时候练习太极，不为任何诱惑所动。某日，他接受一项神秘的任务，随后启程前往西班牙马德里。在这里他必须和一个又一个联系人作单线联系，而联系的凭证便是红色或绿色的火柴盒。这些联系人中，有谨小慎微但热爱音乐的中年男子（路伊斯·托沙 Luis Tosar 饰），有打扮出众钟爱电影的白衣女子（蒂尔达·斯维顿 Tilda Swinton 饰），有醉心波希米亚文化的老人（约翰·赫特 John Hurt 饰），更有沉迷分子学的神秘东方女性（工藤夕贵 饰）。按照他们的指引，杀手一步步逼近了他的目标……

　　The film follows successful business owner David (Ochmann), who leads a comfortable life alongside his boyfriend, Álex (Bassave), an attractive gym instructor. The latter has always wanted to become a father and often wonders which path he should follow in order to make his dream come true: adoption? A surrogate mother? Nevertheless, David refuses to discuss the subject. That is, until Blanca (Perroni), David’s sister, with whom he broke off all contact after a dark event in the past, bursts into their lives. She used to be a drug addict and, in one terrible moment of carelessness, started a fire that killed their parents, for which she was sentenced to six years in prison. But now, she is clean and has resolved to win back the only family she has: that’s why she will be willing to do whatever it takes to persuade her brother to accept her into his life again.

　　一对年轻夫妇撰写他们家庭分享的历史故事，两人都将揭露他们亲戚的黑暗秘密，而其中一人必须坦白痛苦的事实。

　　故事围绕着一个中国移民家庭和两个不同背景的中国女孩展开。Lucia是出生在西班牙的中国移民二代，父母亲开杂货铺，他们每天工作十几个小时，不会说西班牙语，她最大的愿望是可以像其他孩子一样在汉堡王过生日，和拥有一对“正常的父母”。Xiang是被西班牙父母收养的中国女孩，她因身世而感觉到自己和周围的环境格格不入，同时也对自己的亲生父母有着强烈的好奇。