The Unthinkable Daughter features previously unseen interviews with Suzane, who was convicted of murdering her parents, Manfred and Marísia, in São Paulo in 2002. More than 20 years after the crime and over a decade since her last interview, the documentary explores who Suzane has become after serving part of her sentence and confronts her with the findings of the investigation. Archival footage and interviews with experts and people connected to the case round out the narrative.