All 4 Uses

thus
in
A Christmas Carol, by Charles Dickens
(Edited)

Quite satisfied, he closed his door, and locked himself in; double-locked himself in, which was not his custom. Thus secured against surprise, he took off his cravat; put on his dressing-gown and slippers, and his nightcap; and sat down before the fire to take his gruel.
p. 17.4 *

thus = in that way
When everybody had retired but the two 'prentices, they did the same to them; and thus the cheerful voices died away, and the lads were left to their beds; which were under a counter in the back-shop.
p. 46.6
It was a great surprise to Scrooge, while listening to the moaning of the wind, and thinking what a solemn thing it was to move on through the lonely darkness over an unknown abyss, whose depths were secrets as profound as Death: it was a great surprise to Scrooge, while thus engaged, to hear a hearty laugh.
p. 80.7
"Men's courses will foreshadow certain ends, to which, if persevered in, they must lead," said Scrooge. "But if the courses be departed from, the ends will change. Say it is thus with what you show me!"
p. 114.6

thus = that way

Definitions:

(1) (thus as in: Thus it was necessary.)
therefore (for that reason; or what follows is so because of what was just said)
(2) (thus as in: betrayed her thus)
in the way mentioned or shown
(3) (meaning too rare to warrant focus)
The expression, thus far means so far or up until now.