The film follows Adam, a college professor who is struggling with his marriage and career. Adam has a dark secret from his past that he has kept hidden for many years. However, when a new student named Melissa joins his biology class, Adam believes that she might be the daughter he gave up for adoption many years ago.
As Adam becomes more obsessed with Melissa, his life begins to unravel. He starts to lose focus on his teaching and begins to neglect his family. His wife, a lawyer, becomes suspicious of his behavior and starts to investigate his past.
Adam's obsession with Melissa reaches a dangerous level, and he begins to stalk her. When Melissa disappears, Adam becomes the main suspect, and his life spirals out of control. He must confront his past and face the consequences of his actions before it's too late for him and his family.
Biology 101 is a gripping thriller that explores the dangerous consequences of obsession and the dark secrets that can destroy lives. The film stars William Baldwin as Adam and serves as a cautionary tale of the dangers of obsession and the importance of confronting one's past.