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When the Doctor lands his TARDIS in the Lancaster town of Lannet, in the present, he finds that somehing is terribly wrong. The people are scared. They don't like going out onto the streets at night, they don't like making too much noise, and they certainly don't like strangers asking questions. What alien force has invaded the town? Why is it watching barmaid Alison Cheney? And what plans does it have for the future of the planet Earth? The Doctor is helped and hindered by his new military liaison Major Kennet and his Royal Green Jacket troops. His old enemy the Master also plays a small part. During the course of this adventure he encounters a brand new race of ferocious alien monsters, and strikes up a friendship with his latest companion, Alison. While starting with a small community under threat, this old-fashioned, very traditional but very up-to-date Doctor Who story takes in the entire world, from New Zealand to India, Siberia to the USA, and cosmic expanses beyond.