

He is to be a part of a desperate plan to miniaturize a small submarine with a crew of five to be injected into the brain of a comatose patient, specifically the very scientist who possessed the secret of making the miniaturization process economically practical. They kidnap an American "neurophysicist", whose ideas of interpreting the electrochemistry of thought have been widely ridiculed and rejected in the states. In a nutshell, the Russians have the technology to miniaturize anything, but at a huge and impractical cost in power.

This is his revisiting of the same concepts 25 years later in a novel that he describes as his own, almost in entirety. Asimov's original novelization of the 1960s film was good, but someone else's idea.
