Give your suggestions about Holmes' investigation.

Holmes' investigation is very prominent in Scene 4, when he found out that the slipper of Barker covered in blood was a false clue. My suggestion about his investigation would be that he should've made different scenarios of Barker's perspective about the murder of Mr. Douglas so that he could make Barker the possible culprit of his murder. He should also look into the possible weapons that were used to kill Mr. Douglas so that he can uncover the secret of Barker's false story