Bobby Ellis-Chan has a really big secret: His best friend is a girl. Holly Harper has always liked to do all the same fun things he does — like roll down Skeleton Hill in a tire, or hide frogs in her bushy hair — and she gave him his beloved goldfish, Rover, who can do amazing tricks. But now that they're in fourth grade, things are changing. Holly made friends with nasty Jillian Zarr and her wolf pack of other girls, and now she's wearing new clothes, straightening her hair, and laughing at Bobby, even telling some of his secrets. He has to get revenge, doesn't he? Then when Mrs. Carlson announces an election for fourth-grade school representative, all the boys support Bobby, but all the girls line up behind Holly. It's Bobby vs. Holly, boys vs. girls, in the biggest battle ever to rock Rancho Rosetta!