Forget the lamentable (and sadly inevitable) remake Wicker Park and succumb to this exquisite Hitchcockian teaser. It is nigh on perfect (I've seen it 42 times, my enjoyment of the film never diminishes).
Great cast, great score, perfect locations and an atmosphere that sucks you in. To say too much about plot would spoil things for you. There are more twists than at a Chubby Checker convention and the elegant and intense interactions between the characters are spot on.
This film will stay with you days afterwards.
At the price you can buy it for here, buy two copies. You'll probably wear one out.