Mac and team rush to help when Matty's former mentor, Ian Cain, and his embassy staff come down with a deadly, mysterious illness. Also, Taylor and Bozer work with Jerry Ortega to infiltrate a Codex cell.

While on a mission to hunt down a Codex lead, Mac and the team discover Murdoc hacked their comms and has recorded them for months. Now, Mac and the team must stop Murdoc, who is working with Andrews, as they plot to kill thousands and reveal each Phoenix member's most-guarded secrets.