“When ex-CIA operative Kalliope "Kae" Wilder uncovers the truth about Echelon, a mysterious surveillance program, she's drawn into a deadly game of cat and mouse. Joining forces with enigmatic whistleblower Beckett "Beck" Vaughn and rogue hacker Sage Riley, Kae must confront her past and stop Echelon's mastermind, Magnus "The Archon" Blackwood, before global catastrophe strikes.”