An autistic young man with obsessive-compulsive disorder tells his therapist that he mustn't stop counting odd numbers or the cracks in the world will open up and swallow him. She cures him -- but finds that bad things happen when he stops counting.
Link has to count because if he doesn't the cracks in the world will get bigger and destroy everything. Of course, it's all in his mind. Isn't it?
Great little short story well worth a read. This author's other short stories, Future Crime, Credit Check and Captain Power's Hour of Fun!, were also excellent. Very different to one another, but equally enjoyable.