Antique archive appraiser Lyra Bennett is dragged into a sealed underground penthouse by the Moretti crime family to pay her late father's gambling debt. Penthouse master Dante, poisoned for years by his stepmother Belladonna, plays a raving invalid while secretly purging her wiretaps, building a ghost army and plotting revenge. Lyra's appraiser's eye sees through his disguise at first glance. Bound by a deadly alliance, they fall for each other amid bullet-riddled nights and forbidden tension. She slaps her own face bloody to keep his cover; he risks his life to rescue her ailing mother. At last Dante's ghost squad slaughters the Senate, locks Belladonna in the iron cage forever, and kneels to lay the entire empire at Lyra's feet. The debt-crushed underdog rises to rule the underworld beside the Don as its queen.
