DI Lindsay Denton

Lindsay Denton is a police sergeant caught in the wreckage of a botched witness protection operation, the sole survivor of an ambush that leaves colleagues dead. Quiet, guarded and unpromoted for years, she is either a woman who made one catastrophic call under fire or something far more culpable — and she gives almost nothing away.

The writing keeps her opaque on purpose, feeding you sympathy and suspicion in the same scene, and Keeley Hawes plays both truths at once without tipping her hand. Watch her stillness under interrogation — the flicker of hurt, the flicker of calculation — and you realise you cannot actually tell which one is real.