An international secret society of telepathic blood-magic angels come together to destroy what appears to be the reincarnation of Jack the Ripper. This second novel in the Hearts of Darkness series, Track the Ripper takes NYPD detective Dianysus Brentano to London, Glastonbury and Paris as she chases a man who calls himself Jack the Ripper straight into an Internet web that aims to turn followers into killers and control the world. Her resolve to recover what he stole from her attracts allies from among the blood-drinking celestial ma'lakhim. Overwhelmed by their dangerous beauty, Dianysus sets her heart on the leader, Sitri, who has been her secret protector since childhood. But she's unsure if he's equally attracted to her or is exploiting her for his own purpose. Dianysus learns that the mother who'd abandoned her when she was young had been a queen among these creatures. This makes her own blood unique and gives her new skills. When she discovers that the Ripper seeks her blood to complete his conquest, she forms a risky plan.

As the ma'lakhim strive to save Paris and London from mass destruction, Dianysus goes to face the Ripper alone. She must trust that her blood-bond with Sitri is true, because otherwise, all is lost.