The Mistress of Death discovers that hearts never truly die.The Grim Reaper has been collecting souls of the dead for hundreds of years, but even the Master of Death has to pass on his reign. Unfortunately, his progeny is not quite ready to replace him.Cora Grim, daughter of the Grim Reaper, is suddenly thrust into her father's role. Leaving the Underworld on her own to bring back the dead souls, she discovers that the Master of Death neglected to...