...ok...so not Mafia but just kinda felt the thread might sit in here better, anyways... Who is the murderer and what tipped Miss Miller off? Hint: Light!
CTRL-F "Light" Yes, as KK pointed out, is the discrepancy regarding who said the light was on/off upon finding Col. Herbert crucial?
Spoiler The murderer is the maid, Sophie. She claims to have opened the door to the study, seen the Colonel then slammed the door shut and started screaming. But both the butler and the cook attest that the study was dark, and that the corpse didn’t become visible until after the light was turned on. If Sophie didn’t enter the room, she couldn’t have turned the light off, so it must have been too dark to see anything in there. She knew the body was there because she killed the Colonel, unable to bear anymore of his abuse.
The window was broken from the inside, as the glass was in the flower bed outside. If it had been broken from the outside, the glass would be on the carpet. YYYEEEEEAAAAHHHHHHHH!