Lily Mullen

Lily Mullen appears on the edges of the Bureau's world in Mindhunter, a woman whose path crosses the Behavioral Science Unit's investigations. She is guarded at first, sizing up the agents opposite her, her manner practical rather than eager to please, someone with her own sense of what she will and won't give up.

Sarah Wilson plays her with a flatness that resists easy reading, letting small hesitations and glances carry more than dialogue does. Mindhunter thrives on people who won't simply hand over their truth, and Lily's watchfulness fits that pattern, making every exchange with Holden or Bill feel like a negotiation rather than an interview.