Enchanted Glass - Diana Wynne Jones

Aidan Cain's Gran has died, he's been sent to a foster home, and now malicious beings are stalking him. There is one person Gran told Aidan to go to if he ever got into trouble--a powerful sorcerer who lives at Melstone House. But when Aidan arrives, he finds that the sorcerer's grandson, Andrew, has inherited the house. \n \nSomething is rotten in the village of Melstone\n \nAidan Cain has had the worst week of his life. Creepy, sinister beings want him dead. What's a boy to do? With danger nipping at his heels, Aidan flees to Melstone, a village teeming with magic of its own. There he is taken in by Andrew Hope, the new master of Melstone House, who has some supernatural troubles too. Someone is stealing power from the area--mingling magics--and chaos is swiftly rising. Are Aidan's and Andrew's magical dilemmas connected somehow? And will they be able to unite their powers and unlock the secrets of Melstone before the countryside comes apart at the seams?\n