I already messaged some people about this, but I'll put it here as well.
yumyjamy created this AU, so go check them out and tell them I brought you there!
I already know who the killer will be, and how the cola-tectives, (that's what I'm calling them), are going to find out who the murderer is. But I don't know anything else.
Please message me privately if you have any ideas, and if your idea gets accepted and I use it, I'll give you credit.
Also, if you find out who the killer is, or any other aspect of the story, and you put it in the comments section, I'll delete your comment as soon as I find it. Spoiling the story for others is not nice.
Thanks!