The Heat Of The Moment by Frances M Carr

"An exotic location will keep Frances Gardiner's mind focused on her career as a jockey, interrupted by a terrible accident over a year earlier. She can't afford to let love get in the way, but no one could have foreseen how her life was to change when she decided on impulse to take up a job abroad. After a rocky beginning Fran settles into life as secretary to the internationally famous three day event rider Kane Harding. But the handsome Harding finds it hard to trust anyone, especially a woman, and when the beautiful Pilar Mendoza crosses swords with Fran there can surely be only one winner."