The Secrets Of Emberwild by Stephenia H McGee

Nora Fenton inherits a struggling horse farm and a dangerous secret from her father--one that new horse trainer, Silas Cavallero, threatens to uncover as he searches for the truth behind his own father's death. As the two grow closer over their shared passion for horses, the mysteries--and dangers--of the past loom closer than ever.\

A gifted trainer in a time women are not allowed to race, Nora Fenton prefers horses to men. They're easier to handle, they're more reliable, and they never tell her what to do. After her father's passing, Nora is determined to save her struggling horse farm, starting with entering her prize colt into the harness races at the 1905 Mississippi Fair. If she wins, she may have a chance at independence. But when a stranger arrives and starts asking disconcerting questions, she suspects he may have other motives than unseating her in the training job that is rightfully hers.

Silas Cavallero will do whatever it takes to solve the mystery of his father's death--even if it means training an unwieldy colt for Nora, who wants nothing more than to see him gone. But when mysterious accidents threaten their safety and circumstances shrouded in secrets begin unlocking clues to his past, Silas will have to decide if the truth is worth risking ruining everything for the feisty woman he's come to admire.