David Banks reads this action-packed novelisation featuring the Sixth Doctor and Peri.

What links a diamond raid in 20th Century London, a secret base in the heart of the city's sewer system, a cold and desolate planet light years from Earth, and a daring plan to alter the entire course of interplanetary history?

The Doctor's old enemy, Lytton, has allied himself with the Cybermen. Their scheme, if successful, could bring the human race to its knees.

For the Cybermen have journeyed back in time to prevent the destruction of their home world. And for Mondas to survive, the Earth must die...