Roger Mills, a Harley Street specialist, is taking a sailing holiday on the Norfolk Broads. When his six guests find him at the tiller of his yacht with a smile on his face and a gunshot through his heart, all six fall under suspicion.
| Actor | Role |
|---|---|
 Marianna VertinskayaNot listed | Not listed |
 Mirdza MartinsoneNot listed | Not listed |
 Girts JakovlevsNot listed | Not listed |
 Lembit UlfsakNot listed | Not listed |
 Nikolai KryukovNot listed | Not listed |
 Antanas BarčasNot listed | Not listed |
 Janis PaukstelloNot listed | Not listed |
| OOļģerts DunkersNot listed | Not listed |
 Elza RadziņaNot listed | Not listed |
 Kaljo KiiskNot listed | Not listed |