The film begins in East Berlin in the autumn of 1989. The father of a Finnish family visiting the crumbling Berlin Wall rescues a cute puppy, Stormheart, and takes him back to Finland as a pet for his daughters. No one in the family knows anything about the dog, not even its breed.

Little by little, the mystery of Stormheart reveals itself to the family. His parents had served as guard dogs at the Berlin Wall. After the collapse of the Wall, 7,000 wall-guarding dogs were put down and their puppies were given away to anyone. Berlin was free, but the remaining Caucasian Shepherds carried in their genes the bloody history of their parents.

In the film, drama, comedy and tragedy are created by the mere breed-typical behaviour of the Caucasian Shepherd. Still at the puppy stage, Stormheart imprints on Pearl, the 7-year-old daughter of the Finnish family, and in six months, the dog that has grown up to the size of a bear undertakes the task of removing all dangers, threats and obstacles from the path of Pearl, his little protégé. And Pearl, in return, loves Stormheart unconditionally.

”Stormheart” is ”A great animal story” and it is meant for schoolchildren and their families and for all those who love animals.