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Across the room, in a high-backed leather chair, Victoria saw the old man from the reading room. His face was curiously young for someone so long dead.

In 1966, the Doctor defeated the Great Intelligence, but he knew it wasn't a final victory. And his companion Victoria, whose mind had once hosted the evil entity, might still fall prey to its power.

Now it seems that his fears are justified. In a Tibetan monastery, the monks display unearthly powers -- UNIT are investigating. A new university has opened in London with a secret agenda that may threaten the whole country. Victoria, abandoned in an age very different from her own, and haunted by visions of a father she refuses to believe is dead, is slipping into despair and madness. But are the visions which plague her really hallucinations? Or has the Great Intelligence once again made Earth its target for invasion?

"You're on your own, Ace."

The TARDIS is invaded by an alien presence, and is then destroyed. The Doctor disappears. Ace, lost and alone, finds herself in a bizarre deserted city ruled by the tyrannical, leech-like monster known as the Process. Lost voyagers drawn forward from Ancient Gallifrey perform obsessive rituals in the ruins. The strands of time are tangled in a cat's cradle of dimensions. Only the Doctor can challenge the rule of the Process and restore the stolen Future. But the Doctor was destroyed long ago, before Time began.

"Nonsense, child," retorted the Doctor. "Grandfather indeed! I've never seen you before in my life!"

All is not well on Gallifrey. Chris Cwej is having someone else's nightmares. Ace is talking to herself. So is K9. Leela has stumbled on a murderous family conspiracy. And the beleaguered Lady President, Romanadvoratrelundar, foresees one of the most tumultuous events in her planet's history.

At the root of all is an ancient and terrible place, the House of Lungbarrow in the southern mountains of Gallifrey. Something momentous is happening there. But the House has inexplicably gone missing.

673 years ago the Doctor left his family in that forgotten House. Abandoned, disgraced and resentful, they have waited. And now he's home at last.

In this, the Seventh Doctor's final New Adventure, he faces a threat that could uncover the greatest secret of them all.