Kullamannen(1967)

Kullamannen is a Swedish adventure series following brothers Kaj and Tommy as they spend summer at Kullen in Skåne with cousins Peter and Marianne while their parents travel to Italy. The four teenagers stumble into a complex spy plot where allegiances remain murky and danger escalates quickly. Espionage, coded messages, and mysterious light signals transform their holiday into something far more sinister. Mine tunnel chases, kidnappings, and midnight break-ins become their new reality as they struggle to determine who can be trusted. What begins as a carefree summer becomes an unforgettable ordeal that tests their courage and friendship.