A Dark Light

Sundancer's life is a mess. The horse she loved kicked her out of his herd and kept their only son. She's stuck as the lead mare of a herd with a stallion who could care less if his entire herd died. Then there's Thunder, a strange yet annoying horse who keeps nagging Sundancer to give him control of her herd.
Sunpearl is the lead mare of Silverblaze's herd. She's a gentle horse, but an inexperienced leader. She ended up adopting Pepper, Silverblaze's son.
The catch - Silverblaze was the horse who Sundancer loved and still loves. Pepper is Sundancer's son and doesn't even know. Sundancer is driven by a burning hatred for the entire herd - especially Sunpearl. But one winter when circumstances force the two herds together it seems like both a good and a bad thing. Can they get along? Or will their hatred be their downfall?