When journalist Kevin Lee first meets retired academic Frank Peters and hears about an intelligent alien virus that has invaded the Earth, he is naturally very skeptical. However, when Peters is murdered, his skepticism soon turns to a real concern for the future of the planet and the survival of mankind. Kevin joins a group of liked-minded people in Edinburgh dedicated to eradicating the virus. Returning to London, he rescues his colleague Sandi from a London hospital. Finding himself a wanted man, he seeks refuge with members of the group on a remote Scottish island. There he gains a new understanding of Frank Peters – who turns out to be much more than he first appeared. Together, the group make a final bid to eradicate the virus from humanity – and from the Universe.