World-class marathoner Lisa Harper seems unstoppable-until a series of sinister events begins to haunt her training. Cryptic threats, shadowy figures, and a stalker who knows her every move turn her passion into a nightmare. As the obsession escalates, Lisa discovers that her past holds a dangerous secret someone is willing to kill for. With the biggest race of her career approaching and danger closing in, she must outpace a relentless predator before her running obsession becomes her undoing. The Running Obsession is a gripping thriller of endurance, paranoia, and the race for survival.