Horses are miracles

When Spencer Crosby is kidnapped by a cartel in Mexico, she has a slim chance of escaping. The El Diablo Cartel, meaning Devil Cartel, has heard of Spencer's father and is holding her for ransom in one of the most populated cities in Mexico, Tijuana. Spencer is placed in a place nobody can find, because it's under the streets of Tijuana, where a horse is also kept and treated horribly. This horse and Spencer lean on each other to get through what they have to, keeping each other alive. But can they ever escape? They must depend on each other more than ever when the time comes down to it, but they'll need a miracle.