Father Brown hosts a multi-racial jazz quartet whose car has broken down but they are interrupted by Emmanuel Jammite, who claims that cocky musician Joseph Sinclair stole his girlfriend, the band's singer Yveline from him back in Haiti. Emmanuel is a voodoo priest and curses Sinclair, whose corpse is later found floating in a swimming pool. Emmanuel swears his innocence but dies trying to flee from the law. Father Brown believes one of the band members is the true murderer and in trying to confront them almost loses his own life.