During her first visit to an insect lab where her father is deciphering the fundamental laws of genetics, 10-year-old Betsey is initially reluctant to enter this fly world but eventually steps in deeply, receiving an unorthodox education. She is both perplexed and fascinated by how her father applies his genetic research to his games of seduction. In the heat of his excitement, Calvin crosses the line leaving young Betsey traumatized by the time spent with him. Glimpses of Betsey at 21, mourning her father's death, and in old age reveal how this complex relationship, both nourishing and damaging, informs her transition to adult life.