"The Big Sleep" is one of those pictures in which so many cryptic things occur amid so much involved and devious plotting that the mind becomes utterly confused. And, to make it more aggravating, the brilliant detective in the case is continuously making shrewd deductions which he stubbornly keeps to himself. What with two interlocking mysteries and a great many characters involved, the complex of blackmail and murder soon becomes a web of utter bafflement. Unfortunately, the cunning script-writers have done little to clear it at the end.