Another adventure in the Sword Girl series featuring the feisty Thomasina. Tommy is invited to a tournament, but there's just one problem: she has never ridden a horse before.

Flamant Castle is having a tournament! But when one of the squires is injured during practice, Sir Benedict asks Tommy to take his place. He even offers her one of his own horses to ride. It's a dream come true for Tommy. There's just one problem: she has never ridden a horse before - and every time she tries to ride Bess, the horse throws her off! Time is running out. How will Tommy be able to compete?