The Saint (Hugh Sinclair) and Monty (Arthur Macrae) go to Switzerland on holiday, pursued by the reporter Mary (Sally Gray) who is desperate for a story.
However, his holibobs are soon cut short by the appearance of a strange box which various people including The Saint's arch-enemy Hauser (Cecil Parker). The box, when finally opened, reveals that it holds a music box. The Saint thinks this is the key to a secret code, of great value...
This is a typically fast moving B-movie of the period, played light and fast though unexpectedly dark at times (with a number of pointless deaths and a bit of torture). The film is a reasonable watch though not executed very well at times.
