Lily's quiet life is upended when two men from the notorious Bianchi mafia family show up at her family's door demanding answers about the mysterious death of Mr. Bianchi's daughter Rose. They reveal that Rose had secretly been part of their family under an alias. Now, one of Lily's sisters must take Rose's place within the Bianchis. Lily's jealous step-sister Sarah volunteers Lily to go, seeming to blame her for Rose's accident. Unwilling to put her family at risk, Lily reluctantly agrees to enter the viper's nest of the powerful mafia family, living as Mr. Bianchi's new "daughter." At the lavish but oppressive Bianchi estate, Lily endures endless lessons on etiquette and family history as the family mold her into the role of dutiful daughter. Mr. Bianchi's son Luca takes an unwanted interest in Lily, forcing himself on her physically and vowing retaliation when she resists. Lily notices the family growing suspicious of her, realizing Luca has been manipulating them against her. When Mr. Bianchi confronts her about having ill intentions, Luca escalates things by falsely accusing Lily of lusting after power within the family. Lily must find a way to survive this increasingly perilous situation, clear her name, and resist Luca's torment before the Bianchis dispose of her for good. To escape with her life and protect her family, Lily must rely on her own wits and inner strength to outmaneuver the mafia family that holds her captive.