Books for children by Mary Arrigan

The second story in this trilogy is again set in two versions of Dublin, one the city of the present day, and the other, Dubh Linn, a city peopled by faes, angels and demons.
The heroine, Izzy, now knows that she, like her father, is a Grigori, one who must mediate in what is becoming a terrifying pitched battle between forces she barely understands.