This was meant to be Alice's year to shine, but things are already going wrong. First she is given young environmental activist Greta Thunberg as her pen pal for a fictional writing assignment. Why couldn't Alice get someone easy to write to, like a pop star? Then she's put in charge of the Harmony Day Food Fair. It's the ultimate Year Six project, so Alice should be happy, but the food fair has to go online this term, which seems impossible, and she has to work with the most annoying boy in her school. As if she didn't have enough on her plate, Alice gets kicked out of her bedroom by her grandmother coming to stay. Through her letters to Greta, Alice finds herself opening up about her life. And as Alice approaches the hard questions by wondering, 'What would Greta do?', she starts to believe that her voice can make a difference - a big one.