Death Across the Board (S03E07)

A race horse owner hires Gunn to find out who murdered his longtime trainer. The main suspect, a horse-race fixer, wants to hire Peter Gunn as well, to prove he didn't do it. Meanwhile, one of Gunn's "sleazy acquaintances" furnishes leads to other suspects including an ex-circus strongman and a crippled jockey. (Prime Video)