The main antagonist in 'You Should Have Known' is Jonathan Fraser, the charming yet deeply manipulative husband of the protagonist, Grace Reinhart. At first glance, he appears to be the perfect spouse—loving, successful, and devoted. But as the story peels back layers, his true nature emerges. He’s a master of deception, hiding a trail of infidelity, financial crimes, and even darker secrets. His gaslighting and psychological control over Grace are so subtle that even readers might second-guess his villainy until the shocking reveals.
What makes him terrifying isn’t just his actions but how they unravel Grace’s life. His crimes aren’t just personal; they’re systemic, exposing the fragility of trust in relationships. The brilliance of his character lies in his mundanity—he could be anyone’s partner, making his betrayal resonate deeply. The novel’s tension builds not through physical threats but through the slow erosion of Grace’s reality, all orchestrated by Jonathan.