Some weapons are built to kill. The Fourth Weapon was built to change the world.
Six months after surviving Horus, Brooke “Shotgun” Woods has traded the training floor for command. Her first recruits are untested, her organization is still recovering, and the people she once trusted are keeping secrets.
Then intelligence surfaces about the Fourth Weapon—a deniable biological threat designed to resemble a natural outbreak. It was believed destroyed. Now someone is preparing to unleash it before the world’s most powerful leaders.
The trail leads Shotgun through black-market brokers, abandoned research facilities, and the buried history of Horus itself. To stop the attack, she must bargain with the man who once broke her, question the woman who rebuilt her, and follow messages from someone who may know the truth about the teammate she buried without a body.
Because the person completing the weapon is not an outsider.
They are someone Horus trusts completely.
The Fourth Weapon is the gripping second novel in the Horus Thriller series—a cinematic story of covert operations, biological warfare, fractured loyalty, and the devastating cost of choosing the harder right when no one is watching.
Begin with Three Good Weapons, then continue the mission in The Fourth Weapon.
