There is a bad cop secretly undermining his efforts to catch the killer for reasons that will slowly be teased out until you stop caring.

B-plot about the cop's shitty relationship with his child that is slipping into doing a crime.

Set it in rural Yorkshire, the spectre of mass police violence during the miner's strike will vaguely haunt the background but never be properly addressed. The townsfolk distrust the police because they have something to hide, no other reason.