Check out this Underswap AU fanfic featuring a murder mystery and monsters.
After all the monsters from the underground were free, everything seemed to be perfect. The peace between the Humans and Monster wasn’t that perfect but it was alright. Chara lived the monsters in peace and everything was fine. Right? But when Asgore goes to the underground to see how the golden flowers were. A mysterious voice of a child calls out from the room, calling for help. When Asgore goes in the room he spots a teenage child laying on the bed of golden flowers badly bruised and was blooding out. Asgore goes and helps the child, but what he doesn’t know was that, that child was going to change his and his family lives forever.
This about how a girl named Lilly who goes through the underground to go out to save her little sister, before it was to late.
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