You've finished this scene

Holmes argues that unusual features offer useful clues, whereas an ordinary-looking crime may be harder to prove. In this case, considerable evidence supports suspicion against the dead man's son. Even so, Holmes refuses to accept anything without examining it himself and proposes to summarize the circumstances as far as he understands them.
"But it is profoundly true. Singularity is almost invariably a clue. The more featureless and commonplace a crime is, the more difficult it is to bring it home. In this case, however, they have established a very serious case against the son of the murdered man."
「だが、まさしく本当のことだ。変わった点は、ほとんど必ず手掛かりになる。犯罪が特徴に乏しく、ありふれたものであるほど、犯人の罪を立証するのは難しい。もっとも、今回の事件では、殺された男の息子に対し、非常に重大な嫌疑を裏付ける証拠がそろっている」
"It is a murder, then?"
「すると、殺人なのかい」
"Well, it is conjectured to be so. I shall take nothing for granted until I have the opportunity of looking personally into it. I will explain the state of things to you, as far as I have been able to understand it, in a very few words.
「まあ、そう推測されている。自分で調べる機会を得るまでは、何も当然のこととして受け入れはしない。私が理解できた限りの事情を、ごく手短に説明しよう。