It’s been a year since college senior Mila Kozak watched her sister Anya’s tragic accident on course at a horse show. Since then, nothing has been the same. Her relationship with her sister is as shattered as Anya’s paralyzed body. Her boyfriend of two years dumped her out of the blue and, even though she’s doing everything she can to win him back, he won’t give her the time of day. And her favorite thing in the world—show jumping—is tainted by the crippling fear she’ll end up like Anya.

For twenty-two year old Emma Walker, there is one thing that has been at the center of her world since the age of twelve: Horses. As Emma tries to balance a job, her last year of college, and the fallout of a bad breakup, she is thankful for the escape being at the barn around horses still brings her in adulthood. Despite torn feelings of guilt for being drawn to a new horse after the death of her first horse, Emma finds she has an undeniable connection to a chestnut mare named Valentine and begins training the mare to compete in the sport of show-jumping.

Casey Halbach's life was perfectly on track. She had it all: good friends, a loving boyfriend, a decent job with her very own cubicle. Then, she met Sky. Riding instructor, barn manager, and whirlwind of energy, Sky effortlessly launches Casey back into the saddle. Friends are confused, the boyfriend is concerned, and Casey is conflicted - but when she decides to take the plunge and buy a horse of her own, she realizes that she was just dabbling in the shallow end before. Now, Casey's pretty sure she's in over her head, but the crazy thing is: She thinks she likes it this way.

Fifteen-year-old equestrian prodigy Roan Montgomery has only ever known two worlds: inside the riding arena and outside of it. Both, for as long as she can remember, have been ruled by her father, who demands strict obedience in all areas of her life. The warped power dynamic of coach and rider extends far beyond the stables, and Roan's relationship with her father has long been inappropriate. She has been able to compartmentalize that dark aspect of her life, ruthlessly focusing on her ambitions as a rider heading for the Olympics, just as her father had done.

It was a cool, quiet evening at Calumet Farm, where the most valuable racehorses—including the prolific stallion Alydar—had settled into their stalls for the evening. Alton Stone, filling in for the regular night watchman, completed his rounds at the barn. Although nothing seemed out of the ordinary, an inexplicable hunch led Stone to check on Alydar. What he found—a grievously injured horse with no discernable cause—jump-started one of the biggest mysteries to ever hit the horse racing world.