Sexton Blake tracks down a gang who have stolen secrets from a rocket site.
| Actor | Role |
|---|---|
 Geoffrey TooneSexton Blake | Sexton Blake |
 Barbara ShelleySusan | Susan |
| JJohn WarwickCmdr. Chambers | Cmdr. Chambers |
 Jill MelfordPaula Dane | Paula Dane |
| RRichard BurrellTinker | Tinker |
| RReed De RouenMcGill | McGill |