An excerpt from "Horse Whisperer Academy, Volume 4: Betrayed Trust" by Gina Mayer:

Zoe gave Cathy a few minutes' head start, then she took off as well to catch Shaman. When she arrived at the saddle area with him, Cathy was already finished with her gelding. She swung herself into the saddle and trotted off without even acknowledging Zoe with a glance. Zoe waited until the chestnut gelding had disappeared between the trees, then she rode after him.

In the forest, she initially feared that the distance between them was too great and that she had lost Cathy. But suddenly, she spotted Cathy's pink hair peeking out from under her riding helmet. It flickered like a distant fire through the trees. Zoe couldn’t have said why she was following Cathy or what she hoped to gain from it. The chance that Cathy was meeting a stranger in the woods was virtually zero. Her secrets were in her head, and that’s where they would stay, no matter how long Zoe galloped after her. Still, she didn’t give up the chase.

Now Cathy left the path and guided Summer between two trees and towards a small stream. Zoe followed her without hesitation, and as she veered off the trail, it happened.