During the dust bowl era of draught in the 1940's in the U.S. midwest, a family of farmers is forced to move to the city after their farm is foreclosed on. They hope to find jobs and financial security in their new home. The change is very hard on the destitute family, but it is most difficult for their son Henry, who is continually bullied by the local boys. Henry tries to donate his beloved dog Hobo to the military as a service dog, but the mutt is rejected. Hobo later proves himself a hero first saving his master's friend from a burning fire, and then helping capture a gang of Nazi saboteurs. After this, Henry begins to be accepted and is able to adjust to his new life.