They took her sister and called it business.Natalia Volkov was seventeen when she pressed a shard of glass into her own palm and swore on the wound.As my blood falls, so will his.Her mother died on the conservatory floor.Her father died beside her.And Ivan Morozov vanished into the canals of Vyerny with seven-year-old Anya in a red dress with a white collar.The police said they had leads.They said a lot of things.Natalia stopped believing them and started learning to kill.For years she sharpened one promise like a blade kept folded against her chest.Find Morozov.End Morozov.Bring her sister home.But the girl with braids and a petal-shaped birthmark who lives in Morozov's house now is fourteen.She has Anya's face.And she does not know Natalia at all.Then the night of the Festival of Blood arrives, and the man who built her into a weapon looks at her across a room gone silent and says the one thing she never planned for."You were never meant to pull that trigger."Now the vow that kept Natalia alive is the same vow that could get her sister killed.One shot.One mistaken target.One choice that ends everything, or everyone she has left.If she keeps her word, she may lose the only family she has. If she breaks it, she betrays the woman who died holding her hand.Blood Vow is a tense, ominous psychological thriller about a blood oath, a stolen sister, a mistaken target, a witness on the run, a crime kingpin's empire, and the impossible choice between vengeance and love.Perfect for readers who love dark revenge thrillers, mafia crime sagas, twisty psychological suspense, ferocious heroines, and a vow that demands everything. A standalone thriller with a heart-stopping reckoning.