Eddie Redmayne in Savage Grace Courtesy of IFC Films

ER: That is what I think, certainly, from actually reading how he describes [things]. There were all these people who said "he is going to kill his mother" and yet there are [his] letters saying she is the most beautiful, wonderful meaningful person in the world. So, I think there is definitely a drug-induced psychological thing, which again the film doesn't dwell on so much.

TK: And I think, not knowing the "why" [makes] people always want to say it is a film about a woman who sleeps with her son in order to cure his homosexuality. Minor part actually! She sleeps with many people in order to conquer them and own them, imprint upon them. It is more obvious that the character of Tony is more mentally unhinged. But actually, what you find out toward the end of the film, Barbara is every bit as crazy as Tony is — it is just that she is wearing a Chanel suit and seems to be a normal customer. But she is nuts! And I think that is why in some ways you have to leave a bit of mystery about it. If otherwise you had to explain all of it...

ER: ... you can't explain it. The way the book accounts for it is that they are human beings that we can't rationalize, in a way that humans can go from one being to another without any seeming bond between them.