On a sweltering summer night in 1925, beauties in beaded dresses mingle with hepcats in dapper suits on the streets of Harlem. The air is thick with reefer smoke, and jazz pours out of speakeasy doorways. Ben Charles and his devoted wife, Angeline, are among the locals crammed into a basement club to hear jazz and drink bootleg liquor. For aspiring poet Ben, the swirling, heady rhythms are a revelation. So is Baby Back Johnston, an ambitious trumpet player who flashes a devilish grin and blasts jazz dynamite from his horn.