Something ate the Rindan consul and her husband alive. And now it's eating humans...
The extraterrestrial diplomatic community blames Doctor How. He and his assistants try to deal with the alien threat quietly, but events spiral out of control when the MI6 headquarters and US embassy come under attack.
Meantime, Doctor How's cousin When has neglected to tell him about a far greater danger, which threatens to destroy the power of the Time Keepers.
Doctor How, his assistant Kevin, and morphing alien superpredator Trinity must exterminate the vermin and find out who's...