Great news, especially for me as I love this series, 'Wire in the Blood' is filming its sixth series as we speak. Val MacDermid has confirmed this on her website.
"Filming is now under way for a sixth series of WITB. Again, we've got a terrific set of scripts and from what I've seen so far, performances to match. So keep an eye on the UK TV schedules and make sure you don't miss it. I guarantee it'll have you sweating in your seat."
As far as I'm concerned it can't come soon enough. The nearest thing to 'Millennium' the UK has ever produced.
Bring it on :)