By day, Penelope is an overlooked student bullied by Vivian, the school's queen bee; by night, she's an underground fighter. She falls for Samuel, her bad-boy rival in the ring, but he refuses to define their relationship. Meanwhile, letters from a mysterious boy called "Let"become her emotional refuge. As secrets and Let's true identity emerge, Penelope must choose between guarding her heart and risking it for love and truth.