This is about a single mother (the author), an autistic boy (her son) and a cat (who they met by accident). It seems that the author had a good childhood, but it didn't exactly prepare her for the birth of her son, who wasn't like other baby boys. It took several years to learn that the boy was autistic, previous to which a lot of people had stereotypically assumed that he was a badly behaved boy and that his mother wasn't very good. You might think in this day and age that the relevant authorities would be able to detect autism at a very early age, but it's clearly not the case. Even having identified the problem, it still wasn't easy for mother and son to communicate with each other.
One day, a stray cat in poor condition walked into their life and the mother took it to the vet, not sure who if anybody owned it. When the vet was ready to release the cat to a home, the mother was offered the cat. Initially reluctant, she changed her mind when she saw that her son was interested in the cat. From that point on, the son began to communicate in ways that he had not done before. Everything was so much better after that until the cat disappeared one day, and the son relapsed to his previous condition. Three months pass by during which the mother searches extensively for the cat. He is eventually found a few days before Christmas, not by her efforts, but by the microchip she'd had implanted in him when she first took care of him. So the story ends happily, at least for now. The mother knows that she will have to find a replacement cat some day, but that is for the future.
Apart from whatever skill she has shown in dealing with her son, the author has managed to present her story in an interesting way that avoids being too soppy or whatever. I can only hope that the future is good for the family, and that the authorities get their act together and ensure that autism awareness is made more widespread.