WOW! This is crazy! Ok.
Story:
A dude, Clark, works as a reporter. He has a hobby - he investigates rare cases and then makes files just to keep them. He has a friend who is a psychiatrist (+ they were lovers but the broke up). This psychiatrist has a new patient he has a crush on. The thing is that this patient, Alex, is a serial killer. The psychiatrist wants to help Alex so he contacts Clark to interview Alex - he thinks that talking to another person will somehow make him better. So Clark accepts (cause he's kinda empty inside) and goes to Alex's place. They end up in a very strange reletionship, where Clark tells Alex that they're just friends but they're basically lovers (except that Clark doesn't even like Alex, he just finds Alex amusing cause Alex kills only people he's in love).
Some time later shit hits the fan and Clark want to get out ASAP (Alex murdered someone so Alex has something to talk about with Clark). But Alex, feeling depressed, starts to rely on the psychiatrist again (Clark's only friend and ex lover). Alex eventually kills the psychiatrist, cause he's jealous of him being Clark's friend. With these news Clark starts to somewhat panic (but he attended his friend's funeral). Then he decides to kill Alex so he goes over to his house. He got in and there he was "attacked" by Alex - he ust drugged him. When Clark'S woken up he was chained and locked in a room where Alex kept his "trophies". Alex was with him there almost all the time - trying to convince Clark that he loves him. Clark managed to talk Alex into releasing him and then he fu*ing stabbed him! So Alex died + Clark told him (while Alex was dying) that he just happens to hate him enough in order to kill him. Clark then set the house on fire - to destroy the evidence. So Clark remains free. The only other person besides Clark ho knows what had happened is a detective - Clark told him. And that's the END.
Read ch. 53 (the end)
Interview with a Murderer