In The Witches, a young boy, Luke, goes to live with his grandmother when his parents pass away. His grandmother teaches him lots of useful things about witches, real witches, who live all over the world and who make it their business to kill as many children as they can. Eventually, he finds himself trapped in the witches clutches when he mistakenly gets locked into their annual convention and overhears their plot to turn all the children in the world into mice! Things go badly.
Luke's Grandmother was very intelligent and cautious. She loved Luke so much that it showed through the pages, as they talked.