Ok as a huge scorsese fan i have to admit this was not very good. The plot was incredibly obvious, the 'twist' glaringly obvious, looked way too much like a cheap homage Hitchcock film (De Palma anyone) and was overall pretty dull.
If anyone else but Martin made this it would have been panned mercilessly.
The double twist ( hinted at) at the end seemed tacked on, though it did improve it.
Torture...Torture...It pleasures me...