When her husband is killed in a hit-and-run bicycling accident, it takes all of Michele Lopez Hanson’s strength not to burrow into their bed for the rest of her life. But their kids need her, and she promised herself she’d do the Kona Ironman Triathlon in Adrian’s honor, and someone seems to be stalking her family, so she slogs through the pain to keep herself on track. Her dangerously delirious training sessions become a link between her and Adrian, and she discovers that if she keeps moving fast enough to fly, she can hold onto her husband — even as she loses her grip on herself and faces her biggest danger yet.