Aiden Rourke was the CIA’s most precise weapon—until one mission in Belgrade shattered everything. Ordered to eliminate a ghost asset whose name didn’t appear on any official ledger, he hesitated. For the first time in his career, he disobeyed.

Because the target wasn’t a stranger.
It was the woman he once loved.

Lira Vass, the infamous phantom operative known only as “Echo,” has lived years in the shadows—betrayed, branded a traitor, and hunted by both the agency she served and the syndicate she escaped. When Aiden’s bullet grazed her skull instead of killing her, it forged something darker than forgiveness between them: a silent vow, bound by blood and secrets.

Now a conspiracy bigger than governments is moving pieces across the world, and both of them are on the kill list. Forced into an uneasy alliance, Aiden and Lira must unravel a covert operation known only as OATHBREAKER—a program designed to erase agents like them from history.

But as they race through a labyrinth of double-crosses, coded messages, and weaponized memories, one truth becomes impossible to outrun:

Someone high inside the intelligence world wants Aiden and Lira dead.
Someone who knows their past.
Someone who remembers the night that broke them.

The Silent Vow isn’t just a spy thriller.
It’s the cost of betrayal.
The weight of devotion.
And the one bullet that changes everything.