There are so many crime dramas nowadays that it's hard for them to distinguish themselves. 'Hunter', a second outing for the characters who previously appeared in BBC TV's 'Five Days', is more conventional in plot structure than its predecessor; but as with that earlier series, concentrates heavily on the procedural elements of policing, and even lacks the maverick cop who is a staple of the genre. However, it does involve devious killers with unlikely an master-plan (another regular feature of such dramas), and Claire Holman (once of 'Inspector Morse' fame) again playing a police doctor. Bits are convincing, others less so; but the real problem is a certain lack of conviction, as if the writers knew they aren't saying anything really new. 'Hunter' isn't awful; but it pales compared to 'Prime Suspect', it's most obvious inspiration, which had generally better writing and acting.