The Hollow Kingdom: Book I -- Kingdom Trilogy

For thousands of years, young women have been vanishing from Hallow Hill, never to be seen again. Now Kate and Emily have moved there with no idea of the land's dreadful heritage—until Marak decides to tell them himself. Marak is a powerful magician who claims to be the goblin king, and he has very specific plans for the two new girls who have trespassed into his kingdom . . . is a 2004 Bank Street - Best Children's Book of the Year.