In the summer of 1974 a heatwave blankets Boston and Mary Pat Fennessy is trying to stay one step ahead of the bill collectors. Mary Pat has lived her entire life in the housing projects of Southie, the Irish American enclave that stubbornly adheres to old tradition and stands proudly apart. One night Mary Pat's teenage daughter Jules stays out late and doesn't come home. That same evening, a young Black man is found dead, struck by a subway train under mysterious circumstances.