Ava and Aiden Carter seem like a loving married couple raising their five-year-old son, Milo. But both are hiding dangerous second lives. Aiden is Ghost, an elite operative tied to Black Ledger, while Ava is Viper, a FID agent ordered to capture him.When Ghost and Viper finally meet on a mission, they point guns at each other without realizing they are husband and wife. Familiar scars, fighting habits, and instinctive acts of protection slowly expose the truth.