While this book doesn't seem to be available in ebook, you might be able to find it used.
Summer Games by Elizabeth Lowell, Silhouette Intimate Moments #57, was first published in 1984. Considering the Summer Olympics are on, it seemed an appropriate choice.
UPDATE: Seems it is available in ebook under the title Remember Summer.
Raine Chandler-Smith belied her slight figure with a surprising strength. She had the skill, timing, and sheer guts it took to guide a Thoroughbred through grueling cross-country endurance events. For Raine, the Olympics was the culmination of a lifetime of competition.
For Cord Elliot, the Olympics was a dangerous assignment--to guard against a terrorist attack. And Raine, the woman of softness and surprising steel who beguiled him from the first, was the prime target.
A core of the same wild courage drew them together. But danger swirled around them, and it would take all their fierce will to protect their love.