In 1948, Johns served as the outspoken spiritual leader of the Dexter Avenue Baptist Church in Montgomery, Alabama. Incensed at the racial injustice that pervaded the South, he was determined to fight for equality for all African Americans.

Over a single, pivotal Saturday in 1930s Harlem, 14-year-old John Grimes wrestles with his religious calling and his fraught relationship with his abusive, hypocritical stepfather, Gabriel. Extended flashbacks explore the oppressive Southern past and personal histories of John's mother, his aunt, and Gabriel, ultimately illuminating the generational trauma and complex family secrets that shape his life.