A faerie astride a dragonfly, a hobgoblin trapped inside of a crow, and troubling dreams about mermaids are all part of the mystery when Eliza and Alfred's father is stolen away by the faeries. After the kidnapping the children travel to the Highlands of Scotland to find their father. Not only do they learn that they have faerie blood, but their father's disappearance is part of a darker plot by Queen Mab to bring together the Unseelie Court and the Unforgiven Dead in order to wield unimaginable power.