The Hollow Kingdom is by Clare B. Dunkle. The first book in The Hollow Kingdom trilogy. For thousands of years the women of Hallow Hill have been vanishing never to be seen again. Legend has it that they have been kidnapped by the goblins who live under the hill. When orphans Kate and Emily come to live with distant relatives at Hallow Hill they have no idea of its history or their danger. Then they meet Marak, the Goblin King, who is in search of a bride.
Ratings: 7th grade - 8 out of 10 - AC (some mature thematic content).