A rogue. An outlaw. An unlikely hero. Viking is the sole offspring of a savage and vicious mare. The colt is the pride of the stable until his dam kills a groom in her stall. Viking is a painful reminder of the tragedy, and so he is sold off.

The black colt has a coarse face and a mean curl to his nostrils, but he is beautifully proportioned with magnificent gaits. With his teeth and thick weapon of a tail, Viking brutalizes everyone who handles him and humiliates the best trainers in the world until Anne O'Neil from the United States tries him.

The first time she rides him, she declares that she will not buy him if he was the last apple in the barrel. The second time, she rides him with a different philosophy, as if he is as sensitive as one of her Thoroughbreds, and she is amazed by the results. Kindness and sugar turn out to be the keys to Viking's heart. Viking and Anne become rising stars until a cruel and brutal trainer seeks to crush his spirit.

A Horse Named Viking follows the life journey of an incredible, unforgettable horse.