Nicholas wants to find one thing that he’s really good at. His friends are all good at something. His annoying next-door neighbour Ruby claims to be good at lots of things. And then there’s Oliver Billington, who always wins everything. Perhaps he’s good at baking. Nicholas discovers he can bake delicious and impressive cakes. But are they delicious and impressive enough for The Great Chocolate Cake Bake-Off? He’s got his Top Secret Ingredient. That might help. But what if it runs out…