In A Perfect Vacuum, Stanislaw Lem presents a collection of book reviews of nonexistent works of literature--works that, in many cases, could not possibly be written. Embracing postmodernism's "games for games' sake" ethos, Lem joins the contest with hilarious and grotesque results, lampooning the movement's self-indulgence and exploiting its mannerisms.

Beginning with a review of his own book, Lem moves on to tackles (or create pastiches of) the French new novel, James Joyce, pornography, authorless writing, and Dostoevsky, while at the same time ranging across scientific topics, from cosmology to the pervasiveness of computers. The result is a metafictional tour de force by one of the world's most popular writers.

Twenty-five hundred scientists have been herded into an isolated site in the Nevada desert. A neutrino message of extraterrestrial origin has been received and the scientists, under the surveillance of the Pentagon, labor on His Master's Voice, the secret program set up to decipher the transmission. Among them is Peter Hogarth, an eminent mathematician. When the project reaches a stalemate, Hogarth pursues clandestine research into the classified TX Effect--another secret breakthrough. But when he discovers, to his horror, that the TX Effect could lead to the construction of a fission bomb, Hogarth decides such knowledge must not be allowed to fall into the hands of the military.