Michael Slade is a successful businessman who gets injured in a crash and suddenly develops a third eye on his forehead. He eschews treatment, and instead tries to learn to see from the third eye. As a result his wife divorces him and he is generally shunned. But when he does learn to see well with all three eyes (curing his previous two-eyed astigmatism in the process), he finds that he can transport himself to another world, apparently coexistent with Earth. This world is inhabited by three-eyed people.