The plans of the young couple Daniel and Clarice are thwarted by Vitor Lopo Jr. He orders the kidnapping of the couple's newborn daughter, Mariana, who ends up living with Pestana and Elza—a pair who have kidnapped other children as well. Among the children kidnapped by Elza and Pestana is Joãozinho, the son of Joana and Felipe Marinho. The plot takes major unexpected turns.

Prova de Amor ran for 1 season. No new episodes are scheduled.