Stones — Pat Graversen

Ever since Cami's dad died in a plane crash, life hadn't been easy for her and her mother, Porter. Now they had moved into a big old house in New Hope, Pennsylvania, where Porter was going to run a rare book store. It seemed like things were finally going to be okay again. Then the stones arrived. -- They were a strange grayish green, and about the size of robins' eggs. Dad had collected the stones on that last trip to Turkey, and it had taken all this time to catch up with them. Cami thought they were weird, but Porter decided to decorate the garden with them, and they did look pretty neat, all in circles around the bushes.

The only trouble was, every morning the stones were in a different design. Cami knew her mother thought she was doing it. But she wasn't. Cami had a terrible feeling that they had planted something evil in their very own garden. Especially when she noticed that the stones were moving little by little into a distinct and horrifying pattern...