Sam and team search for a link between two very different murder victims who bear the same signs of torture. What they find leaves them shaken.

The simultaneous death of three heart patients who share the same implant spurs a hunt for a medical hacker and puts someone close to the team on edge.

After a drone attack on a power plant plunges the city into darkness, Billie and Sam discover it's just the first step in an alarming master plan.