For Libby, running was the one thing that made everything better. But when her depression hits so hard even running doesn't help, she finds herself hopeless and alone on the edge of the Ben Franklin Bridge. Then there's Mac. Handsome, intelligent, and surprisingly awkward, he has less than twelve weeks to prepare for a marathon he never intended to run. When Libby agrees to help Mac train, neither anticipates just how much one race could change their lives—if they're willing to step off their predetermined paths and chart a new course together.