Season 01 episode 02 The Blind Banker Original Edition: The Sign of Four.

Season 1, episode 3 Great game: the whole adventure history and five orange ideas.

The scandal in levia in the second season episode/kloc-0.

Season 02 episode 02 hound of Baskerville original: hound of Baskerville

Season 2 Episode 3 Reichenbach Autumn Original Edition: The Last Question

In the third season, episode 1, an empty car was adapted from an empty house.

In the second episode "Three Signs", there is a case of four signs in the original work.

The third episode, his last oath, is based on Milwalton.

The first episode of the fourth season, Six Portraits of Margaret Thatcher, was adapted from the original six busts of Napoleon.

The second episode, The Lying Detective, is adapted from The Dying Detective.

The main plot of the last puzzle in the third episode seems to have little to do with the original, but it pays tribute to three people with the same surname and the Musgrave ceremony in the original.