'What I need,' said Pearl, as she started to slide off the roof, 'is a grandmother.'

But where do you get a top gran at short notice? It's not easy.

Luckily Pearl's got Winston to help her, and you can do anything when your best friend is the world's brainiest guinea pig.

Then Pearl meets Gran and the surprises begin.

Prepare for an emotional journey filled with laughter and tears as Pearl and her best friend Winston embark on a quest that will test their friendship and challenge them to learn valuable lessons about perseverance and acceptance.

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PRAISE FOR MORRIS GLEITZMAN

‘Readers can't get enough of him.’ The Independent

‘A brilliantly funny writer’ Sunday Telegraph

‘A virtuoso demonstration of how you can make comedy out of the most unlikely subject’ Sunday Times

‘He is one of the finest examples of a writer who can make humour stem from the things that really matter in life.’ The Guardian