i couldn’t find anything about the detective person too. The other party is in the orange room, in the top right corner. To open the party, you need to tap upwards 6 times. So, we’re in B3, and tapping upwards turns it into B2, and we can enter the party.
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Tysm! Okay after a bit of playing around (AKA tapping on a bunch of walls and moving things around I finally figured it out. The part with the detective has not been completed for the game quite yet but what you have to do is go through the tubing network and use the guide as a form to get the pipe to open. Then you arrive to a mouse who explains the stuff about the detective and the game’s continuation of creation.