この場面を読み終えました

ホームズは当面の仮説にとどめ、事件にはなお多くの未解決の問いがあると話す。ブーンの過去から決め手は得られず、氏の行方も分からないままである。
"Well, we will take it as a working hypothesis for want of a better. Boone, as I have told you, was arrested and taken to the station, but it could not be shown that there had ever before been anything against him. He had for years been known as a professional beggar, but his life appeared to have been a very quiet and innocent one. There the matter stands at present, and the questions which have to be solved—what Neville St. Clair was doing in the opium den, what happened to him when there, where is he now, and what Hugh Boone had to do with his disappearance—are all as far from a solution as ever. I confess that I cannot recall any case within my experience which looked at the first glance so simple and yet which presented such difficulties."
「そう、もっとよいものがない以上、当面の仮説としておこう。言ったとおり、ブーンは逮捕されて署へ連れていかれたが、過去に問題を起こした証拠はなかった。何年も物乞いとして知られていたが、暮らしぶりはまったく平穏で、悪いところはないようだった。今はそういう状態だ。セントクレアがアヘン窟で何をしていたか、そこで何が起きたか、今どこにいるか、ブーンがその失踪にどう関わったか、どの問いも相変わらず解けていない。正直、経験した事件の中で、初めはこれほど単純に見えながら、これほど難しかったものは思い出せないよ」