The Doctor put out the candle when you opened that Hidden Room.

Why?
Because he thought Courtleigh Fleming was hiding there!" Now the missing pieces of her puzzle were falling into their places with a vengeance.

"But at this moment," she continued, "the Doctor believes that Fleming has made his escape! No--we haven't solved the mystery yet.

There's another element--an unknown element," her eyes rested for a moment upon the Unknown, "and that element is--the Bat!" She paused, impressively.

The others stared at her--no longer able to deny the sinister plausibility of her theory.