DO NOT GO TO THE LOCATION ABOVE. THOSE COORDINATES ARE FAKE. THEY WILL TAKE YOU TO A DEAD END.
This is the final bonus cache for the Adventure Lab, "Grove City Clue!" You will need to complete the Adventure Lab before you can solve this puzzle.
As you completed the Adventure Lab Locations, you found Suspects, Weapons, and Rooms along the way. The ones you found were NOT the correct answer. You'll want to eliminate all of those answers and the Suspect, Weapon, and Room that remains is the correct solution.
There are two more rooms that can be eliminated. You don't have to go to these locations, but you'll have to look them up somehow.
N 40 01.010' W 83 09.500'
N 39 58.040' W 82°57.290'
Once you have the correct solution, apply the following to the fake posted coordinates:
Correct Suspect (only one is correct) -
Miss Scarlet: add .200 to north
Col. Mustard: add .800 to north
Prof. Plum: add .600 to north
Mr. Green: add 1.000 to north
Mrs. Peacock: add .400 to north
Mrs. White: add .500 to north
Correct Weapon (only one is correct) -
rope: add .200 to west
lead pipe: add .800 to west
wrench: add .600 to west
knife: add 1.000 to west
candlestick: add .400 to west
revolver: add .500 to west
Correct Room (only one is correct) -
Kitchen: add .020 to north and west
Ballroom: add .080 to north and west
Conservatory: add .060 to north and west
Billiard Room: add .010 to north and west
Library: add .040 to north and west
Study: add .050 to north and west
Hall: add .030 to north and west
Lounge: add .090 to north and west
Dining Room: add .070 to north and west