Everyone thinks Willa Mercer is the spoiled, fragile daughter of a boxing dynasty. No one knows that before she came home, she spent ten years dominating underground rings behind a mask. When eight rival gyms ambush the Mercer anniversary, exploit stolen medical records, injure her brothers, and force her father to surrender his gym, Willa is ordered upstairs for her safety. Instead, she sets down her strawberry cake, pulls on the gloves, and stakes an impossible wager: eight championship belts against one retired girl. But when a trainer recognizes her stance, the challengers realize who they have awakened.