Alfred Hitchcock, Reginald Gardiner
A serial killer known as "The Avenger" is murdering blonde women in London. A new lodger, Jonathan Drew, arrives at Mr. and Mrs. Bunting's in Bloomsbury and rents a room. The man has some strange habits; he goes out during foggy nights and keeps a picture of a blonde girl in his bedroom. The Buntings' daughter Daisy is a blonde model engaged to Joe, a detective. When Joe finds out that Bunting suspects Jonathan, he is jealous of the lodger flirting with Daisy and arrests the man, accusing him of being The Avenger.—Claudio Sandrini