“As long as she was on the scene (поскольку Мэри была на месте преступления = замешана в этом преступлении; scene — место действия /в пьесе, романе и т. п./; место происшествия, события; the scene of the crime — место преступления) he could not take any action without a horrible exposure of the woman whom he loved (Артур не мог ничего предпринять без ужасного разоблачения женщины = не разоблачив при этом женщину, которую любил; exposure — подвергание какому-л. воздействию; выставление, оставление /на солнце, под дождем и т. п./; разоблачение, выведение на чистую воду). But the instant that she was gone he realized (но в тот миг, как она ушла, он понял) how crushing a misfortune this would be for you (каким сокрушительным несчастьем будет для вас /пропажа диадемы/), and how all-important it was to set it right (и как важно исправить дело; all-important — имеющий первостепенное значение, крайне важный). He rushed down, just as he was, in his bare feet (он бросился вниз, в том виде, в каком был, босиком), opened the window (открыл окно), sprang out into the snow (выскочил на снег), and ran down the lane (и побежал по дорожке), where he could see a dark figure in the moonlight (где в лунном свете различил темную фигуру). Sir George Burnwell tried to get away, but Arthur caught him (сэр Джордж Бэрнвелл попытался бежать, но Артур догнал его), and there was a struggle between them (и между ними завязалась борьба), your lad tugging at one side of the coronet (ваш мальчик тянул диадему за один конец), and his opponent at the other (а его противник — за другой).

“In the scuffle, your son struck Sir George (в драке ваш сын ударил сэра Джорджа) and cut him over the eye (и рассек ему бровь). Then something suddenly snapped (затем что-то неожиданно хрустнуло), and your son, finding that he had the coronet in his hands (и ваш сын, почувствовав, что диадема у него в руках), rushed back (бросился назад), closed the window (закрыл окно), ascended to your room (поднялся в вашу комнату), and had just observed that the coronet had been twisted in the struggle (и только тут заметил, что диадема погнута во время борьбы) and was endeavoring to straighten it (и пытался распрямить ее) when you appeared upon the scene (когда появились вы).”

scene [si:n], exposure [k'spu], opponent ['punnt], ascended ['send]

“As long as she was on the scene he could not take any action without a horrible exposure of the woman whom he loved. But the instant that she was gone he realized how crushing a misfortune this would be for you, and how all-important it was to set it right. He rushed down, just as he was, in his bare feet, opened the window, sprang out into the snow, and ran down the lane, where he could see a dark figure in the moonlight. Sir George Burnwell tried to get away, but Arthur caught him, and there was a struggle between them, your lad tugging at one side of the coronet, and his opponent at the other.

“In the scuffle, your son struck Sir George and cut him over the eye. Then something suddenly snapped, and your son, finding that he had the coronet in his hands, rushed back, closed the window, ascended to your room, and had just observed that the coronet had been twisted in the struggle and was endeavoring to straighten it when you appeared upon the scene.”

“Is it possible (возможно ли это)?” gasped the banker (задыхаясь, воскликнул банкир).