The picture deals with a deserted house in London as scenario where we find a suspecting hobo (Leon Lion , film producer and he played similar role at stage) , a young girl called Nora (Grey), a detective and a gang of thieves involving the robbery of a necklace . This early British film (shot before ¨39 steps¨) contains humor , tension , action with superb ending pursuit and results to be quite entertaining . It's a comical thriller with parody elements and suspense appears threatening and lurking in every stairs , corridor , hallway and rooms . The movie gets a Germanic expressionist atmosphere in lights and shades creating dark scenarios . Runtime is short-time for that reason is quickly seen ; one hour , approximately . As the famous interview Truffaut-Hitchcock , he said this film was a disaster , he contracted several cats for shooting scenes at home but they wander and was impossible to control them for its numerous proprietaries . The film has various Hitchcock touches as well as the ¨McGuffin¨ , this time seem to be the robbed necklace ; furthermore , the overlong and exciting chase sequence of a train and a bus realized with a maquettes and miniatures . Thirty four years later , Hitchcock will repeat bus pursuit in ¨Torn curtain¨ . His screenwriter Alma Reville ,Hitchcock's wife , wrote a confusing and no well developed screenplay . The following Hitchcock film would be his first great success :¨The man who knew too much¨.