Invisible assassins stalk London, and DCI Rachel Carey is drawn into a case involving a rising politician that brings greater risks than she first imagines.

In the wake of a shocking broadcast hack during an interview with Isaac Turner, Carey must work out who is responsible and whom she can trust.

In the aftermath of a television hack, a major suspect makes a getaway. Time is against DCI Carey as she tries to act before the invisible assassins strike again.

DCI Carey hunts a suspect and the investigation widens its focus. Isaac Turner's family life begins to fall apart, but then he stumbles upon a lead.

Will Isaac Turner meet his digital doppelgänger? DCI Carey pursues a risky new suspect - will she finally find out who is behind everything?

The net tightens. After DCI Carey is kidnapped, her instincts are proved right - but she's in more danger than ever before, while Isaac Turner pursues his own agenda.