Not sure but it brought him a fair bit of success.
There may have been plans to continue but he got film offers and went off to the States I think.
Probably just a curtailed way to wind it up.
I remember being unimpressed at the time.
I was disappointed with Series 4 of Luther. Series 1, 2 and 3 were excellent though.
Has anyone watched The Fall? Quite similar to Luther, has Gillian Anderson and Jamie Dornan in it. I really enjoyed it, watched it on Amazon Instant Video if you guys have that (think there's a month long trial available at the moment)