Publisher's Synopsis
After the death of his mother and the end of his father's high-powered career, Zach and his dad have come to the north of Scotland to live rent-free in Grandfather Alistair's cliff-top cottage. Dad asks Zach to clean out the old garden pond, a rotting nightmare where not even a tadpole can survive. But when he drains the pond, he unearths something unexpected - a trapdoor leading down into darkness.