The theory of the bell appeared excessively weak, and he could not understand a man being so foolish as to put it forward.
"If the button was pressed down by Miss Loach, the bell would have rung at once," argued Cuthbert; "and when it slipped up, even with the heat, the ringing would have stopped.

But the bell rang at eleven, and the girl was in the room two minutes later.

Someone must have rung it.
But why did someone do this, and how did someone escape after ringing in so fool-hardy a manner ?" He could not find an answer to this question.

The whole case was indeed most perplexing.

There seemed absolutely no answer to the riddle.