“Your boy, Arthur, went to bed after his interview with you (Артур после разговора с вами отправился спать) but he slept badly on account of his uneasiness about his club debts (но он спал плохо — его тревожили клубные долги; on account of — из-за, вследствие, по причине; uneasiness — неудобство; беспокойство, тревога). In the middle of the night he heard a soft tread pass his door (среди ночи он услышал тихие шаги мимо своей двери = как кто-то тихо прошел мимо его комнаты), so he rose and, looking out (тогда он встал, выглянул за дверь), was surprised to see his cousin walking very stealthily along the passage (и с изумлением увидел свою двоюродную сестру, которая крадущейся походкой шла по коридору; stealthily — втихомолку, тайно, украдкой) until she disappeared into your dressing-room (пока она /не/ исчезла в вашей гардеробной). Petrified with astonishment (оцепенев от изумления; petrified — окаменелый; застывший; оцепеневший, парализованный), the lad slipped on some clothes and waited there in the dark to see (юноша наскоро оделся: «накинул кое-какую одежду» и принялся ждать в темноте; to slip on — накинуть, надеть) what would come of this strange affair (как дальше станет развиваться это странное дело). Presently she emerged from the room again (вскоре она снова вышла из комнаты), and in the light of the passage-lamp your son saw (и в свете коридорной лампы ваш сын увидел) that she carried the precious coronet in her hands (что в руках у нее драгоценная диадема; to carry — нести). She passed down the stairs (Мэри спустилась вниз), and he, thrilling with horror, ran along and slipped behind the curtain near your door (а он, дрожа от ужаса, метнулся вперед и незаметно проскользнул за портьеру около вашей двери), whence he could see what passed in the hall beneath (откуда мог видеть, что происходит в гостиной внизу). He saw her stealthily open the window (он видел, как Мэри тихонько открыла окно), hand out the coronet to someone in the gloom (передала диадему кому-то в темноте), and then closing it once more hurry back to her room (и затем, снова закрыв окно, поспешила обратно в свою комнату), passing quite close to where he stood hid behind the curtain (пройдя совсем близко от Артура, спрятавшегося за портьерой; to hide).

debt [det], petrified ['petrfad], emerged ['m:d], curtain [k:tn]

“Your boy, Arthur, went to bed after his interview with you but he slept badly on account of his uneasiness about his club debts. In the middle of the night he heard a soft tread pass his door, so he rose and, looking out, was surprised to see his cousin walking very stealthily along the passage until she disappeared into your dressing-room. Petrified with astonishment, the lad slipped on some clothes and waited there in the dark to see what would come of this strange affair. Presently she emerged from the room again, and in the light of the passage-lamp your son saw that she carried the precious coronet in her hands. She passed down the stairs, and he, thrilling with horror, ran along and slipped behind the curtain near your door, whence he could see what passed in the hall beneath. He saw her stealthily open the window, hand out the coronet to someone in the gloom, and then closing it once more hurry back to her room, passing quite close to where he stood hid behind the curtain.