While on vacation, the Saint discovers a much-sought-after music box.
| Actor | Role |
|---|---|
 Hugh SinclairSimon Templar | Simon Templar |
 Sally GrayMary Langdon | Mary Langdon |
 Arthur MacraeMonty Hayward | Monty Hayward |
 Cecil ParkerRudolph Hauser | Rudolph Hauser |
 Leueen MacGrathValerie | Valerie |
| JJohn WarwickGregory | Gregory |
 Manning WhileyMarko | Marko |
 Felix AylmerLeighton | Leighton |
 Ivor BarnardEmil | Emil |
 Gordon McLeodInspector Claud Teal | Inspector Claud Teal |
| RRoddy HughesValet (uncredited) | Valet (uncredited) |
| EEric ClaveringReporter at door (uncredited) | Reporter at door (uncredited) |
| NNoel DaintonCommissaire (uncredited) | Commissaire (uncredited) |