Here's the new Murder Mystery AU I've been working hard on! It's separate from the Xenovirus AU and heavily inspired by TMOSTH (I couldn't get enough of that game despite it being an april fools thing).
After the events of SA2, the world becomes awfully peaceful. Even Eggman quits his villainy, leaving the rest with not much else to do. Life returns to "normal" as they all look for other jobs since heroing isn't a viable income anymore. Vector happens to own a very nice winter lodge that all of the cast meet up in annually to hang out. However, two years ago, something went horribly wrong, leading Mighty to disappear. Despite the rigorous search, he is not found.
Things go quiet until out of the blue, Vector calls them all back after 2 years to try and close the case of Mighty’s disappearance. He says he is in a tough place for money, and nobody wants to buy the place because of the disappearance, saying it’s haunted or cursed. They all come and agree to look for clues on where he might’ve gone, but tensions are rather high. They then realise they can't leave the mansion and friends start to drop off one by one, leaving them to truly look for clues on the murders and find out who might have been behind Mighty’s disappearance.