Vengeance in Velvet

A girl named Alessia Devereaux, daughter of Don Francisco and Donya Bianca Devereaux had an urge to get revenge for her family's death, done by the ruthless mafia named Luciano Valente. For six years, Alessia vanished but she wasn't idle.
She joined a secret underground organization known as La Rosa Nera (The Black Rose), a covert group of spies and assassins formed by survivors of mafia betrayals. There, she learned to kill quietly, to disappear in plain sight, and to smile while plotting someone's death.

Her current mission is personal: infiltrate the Valente empire from the inside and destroy it piece by piece, starting with its ruthless heir, Luciano Valente.