Jed Mercurio's gripping thriller about AC-12 who investigate police corruption at the highest level. There have been many great guest stars such as Lennie James, Gina McKee, Keeley Hawes, Daniel Mays, Thandie Newton and Stephen Graham. The plots are compelling and original, the three leads are outstanding, the action sequences are solid, but there's virtually no humour at all and everything seems a bit too clean-cut for a procedural drama series. I hope it returns next year.