There had been rumours for years about the wealth of old Mr Mackie. But when ben and Richard start snooping around the dead man's house, they're soon plunged into a web of terror. Whose dark face is at the window? Where are the strange footsteps coming from? And what is the secret of the blue ring wrapped in a blanket?

Pursued by a villainous tramp, and haunted by ghastly visions, the two boys find themselves on a daring journey through darkest Wales, and into the unearthly territory of the ancient spirits.