In 1981, after the successful test of a submarine tracker device developed by the Swedish scientist Paul Mandell and sponsored by the US government through his representative Miller, his industry is totally burned and the laser device is stolen. Stig Larsson from the Swedish Secret Agency suspects of an inside job and brings the Swedish Marine Thomas Kallin to investigate Paul undercover as his driver. The naive Kallin is double-crossed but continues his investigation while Larsson finds the truth about the heist.
| Actor | Role |
|---|---|
 Dennis HopperMiller | Miller |
 Hardy KrügerMandell | Mandell |
 Gösta EkmanStig Larsson | Stig Larsson |
| KKåre MölderThomas Kallin | Thomas Kallin |
 David WilsonBaxter | Baxter |
 Celia GregoryTheresa | Theresa |
 Lena EndreAstrid | Astrid |
 Per MattssonSven | Sven |
 Torsten WahlundBlom | Blom |
 János HerskóLazlo | Lazlo |
 Leif AhrleMinister of Defense | Minister of Defense |
 Lill LindforsReceptionist | Receptionist |
| CCharlie ElvegårdComputer Expert | Computer Expert |
| CCarl-Ivar NilssonNaval Officer I | Naval Officer I |
 Sven MelanderShop Assistant | Shop Assistant |
| JJan HermfeltNot listed | Not listed |
 Wallis GrahnNot listed | Not listed |
| UUlf HasseltorpNot listed | Not listed |
| GGustaf ElanderNot listed | Not listed |
| SSten Johan HedmanNot listed | Not listed |
| BBjörn WallmarkNot listed | Not listed |
| KKurt DiopNot listed | Not listed |
| IInga-Lill ÅhströmNot listed | Not listed |
 Annmari KastrupNot listed | Not listed |
| DDaniel EpsteinNot listed | Not listed |