The story of Mexican revolutionary Emiliano Zapata, who led a rebellion against the corrupt, oppressive dictatorship of president Porfirio Diaz in the early 20th century.

In the Salinas Valley, in and around World War I, Cal Trask feels he must compete against overwhelming odds with his brother Aron for the love of their father Adam. Cal is frustrated at every turn, from his reaction to the war, to how to get ahead in business and in life, to how to relate to estranged mother.