Hey erm, I was wondering, what are the 15 endings? There are 6 for the unseccessful accusation of the characters, 1 for if you go home and 1 for (SPOILERS) successfully accusing Nina... but what are the other 7??
You can accuse suspects with if you know their motive or without it. You can also just report no crime and go home. And you can accuse the murderer knowing how he/she did it or not (opportunity). 6*2+1+2=15