On a mission!

Will DS Sarah Collins' approach to policing disrupt an undercover operation..?

- VICTORIA WILSON

THE TOWER Monday-Thursday, 9pm, ITV1 Drama (box set, ITVX)

The stabbing of a teenager in south London threatens to derail a major undercover police operation to bring down a crime kingpin in the third instalment of gritty ITV1 cop drama The Tower.

The series picks up nearly two years after formidable DS Sarah Collins solved the case of missing schoolgirl Tania Mills. This time, she's called to the fatal stabbing of a local lad.

Wall of silence