Sophie's grandma feels old and wrinkly; she's not looking forward to yet another Birthday. Sophie thinks Grandma looks fine. She reckons grandmas are supposed to be wrinkly. But when Grandad shows Sophie his latest invention, she has second thoughts. Maybe there is a way to cheer Grandma up after all - but can they can get Grandad's invention ready in time for Grandma's Birthday? And will it really work?