One morning Ruth Vang comes running out of the apartment, falls down the stairs and is left unconscious. In her apartment the body of the land lord, Otto Hagenberg is discovered. Helmer and Sigurdson search to uncover the killer.

Alf Nordvang
as Helmer

Anders Hatlo
as Sigurdson

Bente Børsum
as Ruth Vang

Arne Lendl
as Arne Vang

Jan Hårstad
as Bjørn Vang

Henrik Scheele
as Per Høøk

Bernhard Ramstad
as Advokat Bentvik

Odd Furøy
as Kontorist Modal

Frøydis Armand
as Vigdis Myrnes

Knut Hagenberg
as Erik Øksnes