When James finds a stray cat on his way home from school, he spends the next few days trying hard to befriend it. One day the stray trusts him enough to share her hidden secret - a fluffy kitten. James takes the two cats home, hoping his mum and dad will agree to keep them. When his mum places a notice in the newspaper, and the owner of the strays turns up, James is forced to accept that his precious little kitten, Mozart, may have to leave.