'Unforgotten' Season 4, Episode 2 Recap: "Some of Those Who Work Forces..."

Unforgotten's second episode is traditionally where Cassie and Sunny spend the hour hunting up the four suspects that the audience met in the first episode. To that end, last week's traffic cop who ties the five together cannot give much on them, other than vague personality impressions. All four acted shellshocked at being pulled over, one was an aggressive male, one was an unflappable girl.

Of course, all Cassie wants is to get their names and start searching their files. If any of these people are still her colleagues, or worse, her superiors, this case will cause a massive crisis.

Collier: You know what we actually need as detectives? A magnifying glass.