Unforgotten 2017, 2018, 2019 / A BBC murder mystery show that gets better as the seasons roll

This six-part BBC crime drama is about two detectives who try to solve cold murder cases. In the first season, they try to solve the murder of a young man from the 70s who left a diary full of seemingly unconnected names.

Like most BBC mysteries, it’s grounded, believable, and consistent. Still, the second and third seasons of Unforgotten are better than the first, offering a reward for sticking with the show.