Rent Messiah: 1 and 2 (2001)

Scotland Yard's tough-talking Detective Chief Inspector Redfern Metcalfe, a man totally obsessed with the minds and motivations of murderers.

Messiah
In the grip of a heatwave: London becomes the stalking ground of a brutal serial killer. Though each death is horribly different, the killer leaves an unmistakeable signature - he cuts out the victim's tongue and replaces it with a silver spoon...
Messiah 2
When Red's estranged brother is found knifed to death in Leadenhall Market, the hunt for justice gets personal. But as the body count rises the horrifying truth dawns: none of the investigating team, or their families, are safe...