Wallace

Wallace is a young PSNI detective drawn into Stella Gibson's murder investigation in Belfast, eager to prove herself among more seasoned colleagues. Sharp, watchful, and quietly ambitious, she does the unglamorous legwork of the case with care, absorbing the unsettling details of a killer's pattern while trying to hold her own in a male-dominated squad room.

Ruth Bradley plays Wallace with a controlled alertness that suggests a mind always working a step ahead of what she's allowed to say. The writing gives her competence rather than backstory, and Bradley uses that restraint well, letting small reactions—a glance, a held breath—carry the weight of a young officer learning what this job actually costs.