Berlin, 1939. The Hot Time Swingers, a popular jazz band, has been forbidden to play by the Nazis. Their young trumpet-player Hieronymus Falk, declared a musical genius by none other than Louis Armstrong, is arrested in a Paris café. He is never heard from again. He was twenty years old, a German citizen. And he was black. Berlin, 1952. Falk is a jazz legend. Hot Time Swingers band members Sid Griffiths and Chip Jones, both African Americans from Baltimore, have appeared in a documentary about Falk. When they are invited to attend the film's premier, Sid's role in Falk's fate will be questioned and the two old musicians set off on a surprising and strange journey.