Rick Altman on Hitchcock's Thriller aspects

"Under the strong influence of Alfred Hitchcock, Thriller often begins with a crime and the accusation of an innocent bystander were the accused to contact authorities no doubt the case could be promptly solved, but instead the poor bystander runs from the law thus jeopardising life and limbs" - Rick Alhman 

"The 39steps... suspense films abandons both thrills and suspense when the falsely accused character finally reaches safety" - Rick Altman