In the 1960s, a group of researchers led by Dr. Peter Neubauer and Dr. Viola Bernard conducted a secret study on identical twins and triplets who were separated at birth and placed into different families. The study, which was partially funded by the National Institutes of Health, aimed to explore the nature versus nurture debate by observing the development of these children in different environments. The participants were not informed of their twin status, and the study's findings were never published. Decades later, the subjects of this experiment discovered the truth about their separation, leading to a search for answers and a reckoning with the ethical implications of the study.