Binding Magick. The Witch Blood Chronicles, #1

Being left behind to hold the fort every time the world needs saving, sucks. Being a witch blood means access to magic, but Carmella Hunter can barely light a candle with her powers. She can bake the perfect cinnamon roll though, and the patrons of Piccadilly's favourite bakery thank her for it. Still it would be nice to be the one doing the saving now and then. You know what they say right? Be careful what you wish for. One attack of flu germs, one delirious episode later and she's bound to a djinn.
A seductive, arrogant djinn who needs her help to track down the monsters hunting his people. With his power coursing through her veins, suddenly Carmella's not so helpless anymore. Maybe this partnership won't be such a bad thing? But someone doesn't want her digging, someone will go to any lengths to make her stop.