Janet Fielding

The Zero Room is gone, and the Doctor’s regeneration is unstable. To help him, Tegan locates the tranquil world of Castrovalva and the TARDIS heads there.

Something is wrong with Castrovalva, but the Portreeve cannot help the Doctor identify the problem. And the Master is taunting Adric, caught in his web of power.

As recursive occlusion threatens to destroy everything and everyone in Castrovalva, the Master’s space/time trap is revealed, with Adric at its heart.

The Doctor returns to Gallifrey only to discover that a deadly game banned and derelict for centuries, has been reactivated. Soon he finds his other selves have also been summoned to assist him in tracing the culprit and tracking down the secret Rassilon.

The Cybermen are released from their silos and are on the march, attacking Briggs's crew and ensuring that the freighter remains on course for Earth. But why?

With her crew vanishing mysteriously, Captain Briggs assumes the Doctor is the guilty party, but the traitor is closer to home… as are the Cybermen.