Nadia writes down everything that happens at the Marrow Lane allotments. So she's the first to spot it: Mr. Okafor's giant champion pumpkin moved overnight. Not gone, just sitting three plots away in Mrs. Pratt's strawberry bed, plump and shiny with dew. By morning both grown-ups are yelling at each other. Nadia opens her notebook and starts writing.

Nadia decides to study the pumpkin itself. She crouches in the strawberry bed and looks close. There are faint drag marks in the dirt and a single muddy footprint near the leaves. She measures the print with her ruler. It's small. Way too small for a grown-up.

Nadia makes a cast of the footprint with mud and a paper cup, just like her detective book said. While it dries, she checks it against the wellies by the shed. One tiny green pair matches: the youngest Lim kid, Theo. At breakfast she tells the grown-ups, and Theo owns up. Case closed.