Holmes did not know, only through observation and reasoning that Watson had been to the post office in the morning and sent a telegram; Judging from the present situation of a watch given to him by Watson, this watch was originally his brother's, and his personality, life track and ending are all clear.

The formal story begins with a visit by Miss Mostein. Her strange experiences and strange invitations naturally aroused Holmes' great interest. With their agreement, the story unfolds gradually, one mystery is solved one by one, and new mysteries appear constantly.

Here, Holmes' intelligence and wisdom are fully displayed, but there are also setbacks and failures. Finally, the arrested murderer told the background and ins and outs of the case.

Extended data:

Sherlock Holmes is a classic of early detective novels in Europe and America, which is characterized by ups and downs, meticulous logical reasoning, meticulous psychological analysis and a well-known detective model Sherlock Holmes. Like, touched the hearts of readers all over the world.

Conan Doyle's Complete Works of Sherlock Holmes has attracted wide popularity, not only because the story is attractive, but more importantly, it creates a rigorous structure of detective novels through rigorous logical reasoning format.

Conan Doyle's 70 detective stories are all based on logical reasoning. He is good at paving the way in conception and layout, making the whole story more tortuous, fascinating and able to withstand repeated scrutiny. Sherlock Holmes was born in the study of the word "blood", but it was this symbol of "four" that made him truly onto the world stage.

References:

Baidu Encyclopedia-Four Signs