Rosso sangue

Arkansas River, Colorado. To spare himself a three-day ride, Ken Parker convinces the captain of what appears to be an ordinary freight boat to find a place for him and his horse. But there is something strange about the vessel: the sailors seem to obey orders like soldiers while Ken is made to work hard and constantly watched. Then suddenly, from a bank, a group of men in military clothes attacked the boat, killing the crewmen. Everyone except Ken.