This is the log of what happened so far

Round 1

Scarlet (pl1)
Enters Hall
Suggests Mr. Green with Wrench in Hall
Mustard (du1) disproves

White (pl2)
Moves outside Ballroom

Accuses Mr. Green with Knife in Study
Wrong!

Peacock (pl3)
Enters Conservatory
Suggests Mrs. White with Knife in Conservatory
Plum (du3) disproves

Round 2

Scarlet (pl1)
Moves outside Hall

White (pl2)
Enters Lounge
Suggests Mr. Green with Knife in Lounge
Green (du2) can't disprove
Peacock (pl3) can't disprove
Plum (du3) disproves

Peacock (pl3)
Moves outside Conservatory