Hard to pinpoint any messages other than the overwhelming one about love being a powerful, all-consuming force. You could argue that one takeaway is that people should trust their instincts (like Luce's about Daniel) -- but also that not everyone is as they appear.
Two fires kill a couple of characters; angels spar and fight in the air; a character's throat is slashed; a character is unconscious after nearly being killed.
A couple of kisses, one make-out session, and some longing looks.
One "f--k" and a few uses of "s--t," "a--hole," "d--k," etc.
During one teen party, the underage guests drink.