All Honest Joe wants for Christmas is Diane. All Diane wants for Christmas is money. More specifically, a wealthy sap who can supply her with the lavish lifestyle she dreams about. Over the course of Roadblock‘s 73 minutes, the audience witnesses Joe’s integrity completely spiral down into the darkest parts of immorality. While the turning point of the film occurs on Christmas Eve, when the holiday spirit changes Diane’s heart, Joe’s manic desire for her has already pushed him past the point of no return.