Mia can see a loyalty score floating above every head. Her childhood sweetheart Jack was a perfect hundred for six years—until jealousy slid in and the number started falling. When he tilts toward the girl he calls his sunshine, Mia doesn't cry or beg. She walks. Picking up running for herself, she's drawn to quiet Ethan, whose hundred never wavered since the day she pulled him into a P.E. group years ago. Jack sinks as he begs, tailgates, and schemes to win her back, but Mia won't chase empties anymore. She chose the one whose number never dropped.