The classic Roald Dahl story with fabulous full-colour illustrations by Quentin Blake.

George Kranky's Grandma is a miserable grouch. George really hates that horrid old witchy woman.

One Saturday morning, George is in charge of giving Grandma her medicine.

So-ho! Ah-ha! Ho-hum! George knows exactly what to do.

A magic medicine* it will be. One that will either cure her completely . . . or blow off the top of her head.

*WARNING: Do not try to make George's Marvellous Medicine yourselves at home. It could be dangerous.

Look out for new Roald Dahl apps in the App store and Google Play - including the disgusting TWIT OR MISS! and HOUSE OF TWITS inspired by the revolting Twits.

"A true genius . . . Roald Dahl is my hero" David Walliams