An engineer and his 5-year old son Rasmus are kidnapped by a group who wants to get their hands on the engineer's latest invention. Three kids become witnesses to the kidnapping and decide to follow the kidnappers to an island and attempt to make a rescue.
Totte Steneby
as Anders
Josefin Årling
as Eva-Lotta
Malte Forsberg
as Kalle Blomkvist
William Svedberg
as Rasmus
Pierre Lindstedt
as Nicke
Rolf Degerlund
as Peters
Patrik Bergner
as Blom
Claes Malmberg
as Poliskonstapel Björk
Jan Mybrand
as Professorn
Victor Sandberg
as Sixten
Johan Stattin
as Jonte
Bobbo Steneby
as Benke
