Who done it!

I think Maggie done it, she is the only one who seems up-beat and she doesn't have that sense of normality, like the other characters. she stood out in some on the scenes just from what she was saying. but now i think maybe Maggie is just a cover up character for someone who really done it. Maggie could just be the one that everyone suspects. when it could be someone who is more in the background. i need to read the script again to get a better idea.