The correct answer is The Doctor.
The Society Girl44%
"We'll start with the easy clue," Amy said. "The footprint. It wasn't left by the victim, so it must be the killer's. It's too large for the Society Girl. Plus it's from a man's shoe. So, she's eliminated.
"Next, the weapon. See how it's positioned, in the right side of the back and angled inward. The killer had to be right-handed. If you check the suspects, you'll see the Professor is the only left-handed one. So, he's out.
"The final clue is in the plot. Although the nephew knew about the priceless figurine, he had no way of knowing it had been placed in the coal scuttle. But the killer knew.
"That leaves the doctor. And if, for some reason, he's not the killer, the movie's website is going to get one flaming e-mail about their plot."