Forbidden territory (1934)

Britisher Sir Charles Farrington and a son, Rex Farrington, arrive in a Russian Soviet territory searching for another Farrington son, Michael,who has been thrown into prison. Valarie Perrovna is a singer who is in love with the imprisoned son and she provides the searchers with the information as to where the missing son is being held. They all go there and help Michael escape. But is their escape vehicle---a flat wagon pulled by three horses--- fast enough and sturdy enough through the snow to beat the Commmisar and his troops to the Rumanian border