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 hack during an interview with Isaac Turner, DCI 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.

Isaac's paranoia intensifies after his hacked TV interview and SO15 widen their search for the invisible assassins.

Will Isaac Turner meet his digital doppelganger? DCI Carey pursues a risky new suspect.

After DCI Carey is kidnapped, her instincts are proved right. Isaac Turner pursues his own agenda.