This new series takes Murphy (James Nesbitt, Cold Feet) deeper and deeper undercover. The stakes are high and the risks enormous as Murphy finds himself embroiled in a complex network of criminality and double dealing. At the centre is David Callard head of the biggest criminal fraternity in London. Murphy must navigate his way through dangerous territory. It's the biggest challenge of his career. Staying in one cover, Murphy becomes increasingly entangled with Callard's world - walking the dangerous tight rope between detection and deception.