An ancient spaceship and deadly illusions force the Doctor and Amy to doubt reality itself

A classic novel starring the third Doctor and the Silurians, back in print When a boy goes missing and a policewoman starts drawing cave paintings, the Doctor suspects the Silurians are back. With the Brigadier distracted by questions about UNIT funding and problems at home, the Doctor swears his assistant Liz Shaw to secrecy and investigates alone. But Liz has enquiries of her own, teaming up with a journalist to track down people who don't exist. What is the mysterious Glasshouse, and why is it so secret? As the Silurians wake from their ancient slumber, the Doctor, Liz and the Brigadier...