After a nuclear attack kills everyone, the last man on earth, going mad from loneliness and isolation, creates a companion in his mind. He soon finds himself living a lie when his imaginary world builds up into something complex.

Noah, the sole remaining survivor on our planet after a nuclear holocaust, finds himself unable to to accept his unique predicament. To cope with his loneliness, he creates an imaginary companion, then a companion for his companion and finally an entire civilization - a world of illusion in which there is no reality but Noah, no rules but those of the extinct world of his memory - our world.—Daniel Bourla