艾薇尔(苏菲·奎茵顿 Sophie Quinton 饰)是一个22岁的漂亮姑娘,修道院里的童年经历让做一名优秀的修女成为了她最大的梦想。要成为一名修女,必须经历闭关受戒的考验,而就在艾薇尔闭关之前,一个消息的传来让她震惊不已。原来,艾薇尔素未谋面的双胞胎弟弟浮出了水面,在亲情的感召下,艾薇尔毅然决定离开修道院,踏上了寻亲的旅程。对于外界的世界,艾薇尔一无所知,好在单纯的她遇见了善良的皮耶(尼古拉·杜沃歇尔 Nicolas Duvauchelle 饰),在后者的陪伴和保护下,两人一路前行。 当弟弟站在眼前之时,艾薇尔却没有想象中的快乐,因为她发现,自己的弟弟竟然是一个同性恋者。但这并没有动摇艾薇尔停留的决心,和弟弟在一起的几日中,艾薇尔经历人生中诸多的“第一次”,也体会到了生而为人的幸福和快乐。Avril is a novice in a convent of "Baptistine" sisters, a monastic order which was officially dissolved by the end of the nineteenth century but that is kept alive by Mère Marie Joseph, the sadistic superior. The rule she imposes on the nuns is particularly strict but this is all Avril has ever known since she was born, for she was an abandoned child raised by the nuns with a view to making one of them. While Avril is on retreat, locked in for a fortnight in a chapel prior to taking her vows, Soeur Bernadette, a sympathetic sister, discloses a secret to her: she has a twin brother and she encourages her to go looking for him...