DCI Roseanne "Roz" Huntley

Roz Huntley is a Detective Chief Inspector fast-tracked to lead a high-profile murder investigation, juggling the case against a demanding home life with a disabled husband and young children. She is sharp, composed under pressure, and visibly ambitious — a rising star who expects the job to go her way.

The writing puts a competent, likeable officer under mounting strain and lets small compromises snowball, and Thandiwe Newton plays every stage of that unraveling with total conviction — the same steely control that makes Roz impressive at the start becomes the thing you watch curdle. It's a masterclass in how ambition and fear can look identical from the outside.