Girls United is the best team for football and friendship. It's her team's first football tournament and Petra Ward can't wait to play. But her mum has some bad news: the match falls on the same weekend as her older sister Charlotte's important riding event. As usual, Charlotte (and the ponies) come first. Petra's compensation is a sleepover at her best friend Megan's house, but even that doesn't run smoothly as Megan invites team-mate Jenny-Jane along too. Petra wonders if anyone will ever put her first.