Avril is a 21 year old novice who has been abandoned a birth in front of an isolated convent in the heart of the mountains.She was raised there by the "Trappistines of the Strict Observance".Mother Marie Joseph tells her it is time for her to utter her perpetual oath.She must make a 2 weeks retreat in the Saint Chapel,apart from the convent.But Sister Bernadette will reveal a secret to April: she had not been abandoned by her self;there was also a boy...her twin brother...whom the abbess decided to entrust to an orphanage.This revelation will overturn the destiny of the young novice,and will lead hey,by her encounter,to discover a world she never imagined,on the path to another truth...