Digital Breakout

Your friend Oliver is enjoying his holidays.  Recently, you received
 a postcard from him. But you'd really like  to figure out where he ACTUALLY is! You head to the library to figure out the mystery, but while you're searching for clues you get caught up in other puzzles. 

Can you solve all the library codes and mysteries, find Oliver and make sure the library is back to normal? Good luck!

How should you like to grow

up a clever man, and write books, eh?' said Mr Brownlow

'I think I would rather read them, sir,' replied Oliver.
'What! wouldn't you like to be a book-writer?' said the old gentleman.
Oliver considered a little while; and at last said, he should think it would be a much better thing to be a book-seller; upon which the old gentleman laughed heartily, and declared he had said a very good thing. 

"Dear me, I am very sorry for that," exclaimed Mr. Brownlow; "I particularly wished those books to be returned to-night."
"Send Oliver with them," said Mr. Grimwig, with an ironical smile; "he will be sure to deliver them safely, you know."
"Yes; do let me take them, if you please, sir," said Oliver. "I'll run all the way, sir."
"You (r)shall go, my dear," said the old gentleman. "The books are on a chair by my table. Fetch them down."
Mr Brownlow said: "You shall go, my dear. Ask Mrs Bedwin to show you the way. And, Oliver…"
Oliver, delighted to be of use, brought down the books under his arm in a great bustle; and waited, cap in hand, to hear what message he was to take.
"You are to say," said Mr. Brownlow, glancing steadily at Grimwig; "you are to say that you have brought those books back; and that you have come to pay the four pound ten I owe him. This is a five-pound note, so you will have to bring me back, ten shillings change."
"I won't be ten minutes, sir," replied Oliver, eagerly. Having buttoned up the bank-note in his jacket pocket, and placed the books carefully under his arm, he made a respectful bow, and left the room. 

"Let me see; he'll be back in twenty minutes, at the longest," said Mr. Brownlow, pulling out his watch, and placing it on the table. "It will be dark by that time."
"Oh! you really expect him to come back, do you?" inquired Mr. Grimwig.
"Don't you?" asked Mr. Brownlow, smiling. (Oliver Twist, Chapter XIV)

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Oliver Twist