Grenfell sets out to discover why the devastating fire of 14 June 2017 happened after the refurbishment of Grenfell Tower, and who was responsible for the deaths of 72 people.

The peacefulness of the Midsomer community is shattered by violent crimes, suspects are placed under suspicion, and it is up to a veteran DCI and his young sergeant to calmly and diligently eliminate the innocent and ruthlessly pursue the guilty.