The important point in it seemed to him to be Lord Loudwater's threats to hound Colonel Grey out of the Army.
Mrs.Turnbull left him plenty to ponder.

Mr.Manley had told him that the handle of the famous knife would probably provide him with an embarrassment of riches in the way of finger-prints.

It seemed to him that the stories of William Roper, Mrs.Carruthers, and Mrs.Turnbull had provided him with an embarrassment of riches in the way of possible murderers.

It grew clearer than ever to him that the inquest must be conducted with the greatest discretion, that as few facts as possible must be revealed at it.

It was also clear to him that, unless the handle of the knife told a plain story, he would get nothing but circumstantial evidence, and so far he had gotten too much of it.
He made up his mind that it would be best to see Colonel Grey at once and form his impression as to the likelihood of his having had a hand in the crime.