I have always found that the best way to encounter an inference is to cause it to be turned into a statement.
"You mean," I said, "that as on the only occasions when actual harm was done, Miss Trelawny's being the first to discover it is a proof that she did it; or was in some way connected with the attempt, as well as the discovery ?" "I didn't venture to put it as clear as that; but that is where the doubt which I had leads." Sergeant Daw was a man of courage; he evidently did not shrink from any conclusion of his reasoning on facts.
We were both silent for a while.

Fears began crowding in on my own mind.

Not doubts of Miss Trelawny, or of any act of hers; but fears lest such acts should be misunderstood.

There was evidently a mystery somewhere; and if no solution to it could be found, the doubt would be cast on someone.

In such cases the guesses of the majority are bound to follow the line of least resistance; and if it could be proved that any personal gain to anyone could follow Mr.Trelawny's death, should such ensue, it might prove a difficult task for anyone to prove innocence in the face of suspicious facts.