Waking the Dead: Book Two of The Dead Series. The Dead Series, #2

When the past comes back to haunt you. Literally. Hyacinth always assumed dying would simplify her life. But when her new boss Archangel Michael sends her on her first official mission-to retrieve a powerful rock from a collector in Germany-things go downhill fast. For one thing, the Dead keep popping up, expecting her to guide them to the afterlife. For another, her part-demon nephew Geordi's powers are leaking out, at age seven.
What if Michael finds out about him? Worse, what if Satan does? Then there's her love life-after-death. Rooming with a dead French cop no one else can see is complicated enough. But when Geordi's lying Dioguardi Demon cousin Jason resurrects himself-so to speak-all Hell breaks loose. Can Hyacinth get Michael's rock back before Satan steals its powers and breaks free of his prison? Or will her single-minded pursuit put those she loves-and the rest of the world-in the path of Satan's fury?