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.

When teenager Dante's parents go on vacation, they give him strict instructions not to "make anything up" while they're away. But when Dante and his friend Tvärsan find a diamond ring in the snow, they're drawn into an exciting detective adventure.

Maria and Leif has a relationship. Leif is a former bank robber. He makes another hit and is sentenced to prison. He urges Maria to forget him.

The terrorist Fors arrested after an attack on a OPEC meeting. Shortly afterwards town minister's daughter gets kidnapped by two men who require Fors be released and that he will flight phase to Albania. SÄPO agent Olsson will handle the case.