What if life made you fall in love with the son of the man who killed your mother? Isabelle, since she was little, lived with two inseparable friends: Luci and Anita. Her life was quiet until the day of her mother's death. Dulce, who left behind three children: Isabelle, Ailton and Rafaelle. The friends try to comfort Isabelle, but she doesn't forgive the man who ran over and killed her mother. The lives of the three brothers are further shaken up when her father, Antônio, marries Rosa, the lover the children did not know, and takes her and her children to live in her house. At the university, Isabelle meets Rodrigo. The two fall in love. After a time of serious courtship, they think about getting married, but discover that her father, Nélio, was the man who killed Isabelle's mother. Meanwhile, in spirituality, Dulce does not accept his death or the events that unfold. She wants to send a psychographic message so that her children know what really happened to her. Time passes and an unimaginable fatality befalls Isabelle, who loses hope of living. In this fascinating and impressive novel, The Certainty of Victory, the Schellida spirit, through the psychographics of Eliana Machado Coelho, returns to address wonderful teachings and valuable reflections in a fascinating saga of love and hate, providing us with the necessary clarifications for our evolution.