《凶兆前传》讲述了一个外地见习修女来到天主教会的中心——罗马，开始在一所高级修道院实习的故事。这所修道院不仅拥有众多慈善设施，还承担着收养妇女和儿童的职责。然而，这里还有一个特别的角色——它不仅是一个妇产科医院，还提供生育服务。这样的设置并不罕见，许多国内知名医院如鞋盒等，最初都是由外国传教士所开办的。而宗教理论复杂且相互矛盾，只有知识分子才能深入探究。普通人信仰宗教，常常是因为寻求治病消灾等现实利益。因此，行医治病也成为宗教常用的手段之一。
我们的女主角来到这家修道院后，主要负责教导和照顾孩子们。然而，她发现其中一个女孩显得特别孤僻，常常一个人躲在房间里画一些莫名其妙的画。这些画作描绘的都是面目可怖的形象，有时还有奇怪的怪物。故事的背景设定在20世纪60年代，即前传故事之前几年。当时，欧洲正发生如火如荼的左翼运动，特别是在法国。这些运动的参与者崇拜毛主席和切·格瓦拉等左翼领袖，被称为五月风暴。然而，法国总统戴高乐用铁腕手段镇压了这些运动。尽管这些运动被镇压，其影响却波及整个欧洲，包括天主教中心罗马。
在这种背景下，年轻人对权威的信仰和宗教生活也受到解放思想的影响。即使在修道院，修女们也受到了这些思潮的影响。女主的舍友修女在一次晚会上，被诱导穿上艳丽的时装，前往夜店释放青春。她与一位年轻男子艾美一起，喝得酩酊大醉，结果第二天早上醒来时对发生的事情一无所知。她心怀愧疚，前往教堂的神像面前忏悔。这一切被一位神父看到，显然这位神父知道内情，他偷偷联系了女主，透露了一个惊人的秘密。
原来，修道院的育婴堂只是掩护教会的一个幌子，实际上这里饲养了一只“野兽”——并非生物学上的野兽，而是圣经传说中的魔鬼类似的神秘生物。教会希望修女与这只“野兽”发生关系，产下所谓的“恶魔之子”。
The prequel film tells the story of a novice nun who comes to Rome, the center of the Catholic Church, to study in a high monastic hospital. Like many Catholic churches, there are many charities here, mainly for the adoption of orphans. What is more special is that this monastic hospital is also a gynecological hospital, or a gynecological hospital. The residents around here offer to have babies. And this is not surprising, many well-known large hospitals in China, such as knot and human, were originally demonstrated by foreign missionaries. And no matter what religion, his religious theories are somewhat complicated and even contradictory, and only intellectuals with a certain degree of education will delve into them. And it is essential for the common people to convince him of some practical benefits of religion. And many ordinary religious motives, nothing more than the wrong people to restore disaster. Therefore, healing the sick and saving people are often used by various religions. After our mistress came to this convent, she was also mainly responsible for teaching the disorder of the orphans raised in the convent. But he found that among these children, there was a child who was particularly unsociable, and there was a girl who was particularly unsociable, always hiding in the room, drawing some inexplicable pictures by herself. In these paintings, pious, benevolent monks are not adorned with gruesome figures, and sometimes there are strange variations in the paintings set in the 1960s, a few years before the prequel stories. At the time, there was a vigorous, vigorous left-wing movement in Europe. The center of these activities. However, at the center of his activities, he was suppressed by the then ruling French President Charles de Gaulle, generals, military police and other iron-fisted means. Similar to this story in another film Dream of Paris has more depiction. Although organized social movements were suppressed, his influence spread throughout Europe, even in Rome, the center of Catholicism, where young people sought liberation in the worship of authority, faith, and religious life. Even the nuns in the convent were influenced by these trends, and the senior sisters who lived with the mistress could not help but live with their roommates. Nuns encouraged in one night to take off Du Mu simple nun robes, put on gorgeous fashion, roommates to release their youth, but also ambiguous with a young man, and finally care about the confusion of love, drink drunk. I remember exactly what happened next. To wake up the next morning, because of guilt, she confessed in front of the church idol, and all this was seen in the eyes of a priest. Apparently the priest is a woman who knows the type, and she secretly contacts her and reveals a secret to him today. It turned out that the foundling hospital in the Abbey was just a cover for the church to pretend to keep a beast, not a biological beast, but the evil demon called the beast in biblical legend. Similar gods and mythological creatures have made the dove have sex with this beast. Giving birth to Cher is called the devil's son, hoping to get the devil's son.
