"Barbara Sleigh's best-known novels for children are the three in the Carbonel series (1955-1978), about a king of cats. These Carbonel books are still in print.[6] Also centred on cats, but for a slightly older age group, is her 1962 novel No One Must Know, a realistic story of a group of neighbouring children attempting to evade a landlord's ban on pets. The Snowball (1969) is a fantasy, in which the snowball turns into a snow-child, causing some fun and chaos in the family." (Wikipedia)