The first half is interesting and very poignant until Guy goes bonkers at the theater production and tries to kill Oswald. After that, it’s all very stupid - the scene at the real estate office, the stabbing of the therapist, and the marriage of Ingrid and Oswald. Nothing believable and so disappointing as a film.
It could have been much more interesting if Edward/Guy’s secret had been revealed to Ingrid and Oswald at the halfway point. Now that would have been a dilemma for Ingrid. Stan is a fine actor, but he can only do so much with a bad script. See him in The Apprentice.