Something peculiar was happening in the grounds of Dr Liskard's remote country home. It was surrounded by enormous, near-prehistoric creatures that could only be seen through the telescope he usually used to study the stars.
Before he could announce the phenomenon to the authorities, he needed independent corroboration—so he invited his publisher to join his niece and her husband at the isolated house to see for themselves.
They quickly discovered that, as incredible as it seemed, the doctor was right.
But what did these strange visitors want? Why did they surround the house every night and just ... watch? What were they looking for?
Then Dr Liskard vanished, and so did his pretty German housekeeper. Psychic phenomena began to manifest itself until the Government sent its top scientist to solve the mystery.
But it wasn't going to be as simple as that. Something equally terrifying was happening below ground. Something that might just spell the end for humanity.