Geronimo Stilton is entered in the Mouse Island Marathon by his friend Champ Strongpaws who then forces him to train for it.

"A chemist for a cosmetics company and an ultramarathon runner, Emma Caldridge is en route from Miami to Bogotá when her plane goes down in the mountains near the Venezuelan border. Thrown unhurt from the wreckage, she watches in horror as guerrillas drag the other passengers into the jungle. Stranded and alone in a deadly environment, Emma has no choice but to follow--and stumbles across Cameron Sumner, an injured government agent who was left behind...

To honor her dead boyfriend and cope with her grief and guilt, college student Annie trains for a marathon with athletic Jeremiah, who flirts with Annie on the trails and makes her feel alive and happy and guilty all at the same time.

"It has been fifteen months since Eva and Angela lost their thrill-seeking husbands in a scuba diving accident. Both women are trying to navigate their way through the grief, but neither one is making much progress. Angela is barely making ends meet, angry at her husband for leaving her to raise three children on her own. Meanwhile, Eva is stuck, unable to move forward after losing the love of her life and her source of inspiration. But then Eva gets...

"Bookstore-café owner Krissy Hancock is stepping out from behind the counter to take part in the first annual Pine Hills, Ohio, marathon. But with a killer close by, she may soon be running for her life . . . It's a brutally hot day in Pine Hills, and Krissy Hancock would love to be sitting in a shady spot and sipping her favorite iced coffee. Instead, she's lacing up her sneakers for a marathon--and swiftly regretting it. Especially when she finds...

"Through a particularly tragic series of events, couch potato Maeve Kelly, an elementary school teacher whose mother always assured her "curvy" girls shouldn't waste their time trying to be fit, has been forced to sign up for the Other Half, Bath's springtime half-marathon. The training is brutal, but she must disprove her mother and collect pledges for her aunt's beloved charity. What Maeve doesn't know is just how brutal some of the other runners...

"Drew was never much of a runner -- until his dad's unexpected diagnosis. Mia has nothing better to do -- until she realizes entering Half Moon Bay's half-marathon could solve her family's housing problems. And just like that they decide to spend their entire summer training to run 13.1 miles. Along the way, they both discover it takes a lot more than a good pair of shoes. Drew and Mia may have very different reasons for running, but these two twelve-year-olds...

When a city council member is murdered during the town's 5K charity run, Abby and her fellow race organizer Gil Pratt must team up once again to prove Gil's brother's innocence in the crime before the real killer makes a run for it.

Determined to regain her sense of accomplishment after losing her top-class ranking to Jonah, Grace decides to compete against him in a Labor Day half-marathon, but as they train together, she learns valuable lessons about what truly matters.