A very simple plot, a kid's story, quite childish, yet the way Dahl delivers it is highly amusing and entertaining. It was a great 'medicine' for a day in which I was exhausted and a bit frustrated.
A kid, George, is tired of the bulling attitude of his grandmother, a horrible old lady who keeps shouting horrible and irritating things to him. He decides to cure her (or to blow her up) with a concoction he makes out of anything he finds in the house and the farm (soap, deodorant, make up, animal's pills, shoe polish, etc), everything boiled up in a huge pot.
Grandma at first starts literally fuming, then grows and grows to be taller than the two-story house. He also gives it to the animals who equally grow like mad. His dad, when comes back home, gets excited as they may become rich by growing their full farm (mom was not so happy though). But the 'medicine' is over.
George tries to make it again, but doesn't remember all the ingredients. After a lot of fruitless attempts they finally reach some results... but this new medicine has a different effect. They give it to grandma who starts becoming smaller, and smaller, and even smaller, until she disappears from sight.
They give up, they will not find the medicine to become rich, but at least... they have got rid of grandma who became so small they coud
