Oracle's Moon (Elder Races, #4)

When Grace Andreas's sister, Petra, and her husband are both killed, Grace inherits the Power and responsibilities of the Oracle of Louisville, as well as her sister's two young children--neither of which she is prepared for. Then Khalil, Demonkind and Djinn Prince of House Marid, decides to make himself a part of the household both as guardian and counterpoint to Grace's impudence towards the Elder Races.