In the Coils of the Snake — Clare B. Dunkle

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 . . .

So begins the award-winning Hollow Kingdom Trilogy. Now in paperback, these editions welcome a whole new audience to the magical realm that Newbery Award winner Lloyd Alexander calls "as persuasive as it is remarkable."