The film is celebrated for its stunning cinematography in Yugoslavia (now Croatia) and the iconic soundtrack by Martin Böttcher .

: Winnetou is the only one who can read the letter, which leads them toward a hidden treasure in the perilous "Valley of Death".

Critics generally praise the return of director Harald Reinl , who captures the "Karl May Western Wonderland" atmosphere better than some later entries. Lex Barker and Pierre Brice maintain their iconic chemistry, though some reviewers feel the series was beginning to show its age by this point.