When you rule out all the impossible situations, the rest, no matter how incredible, are all facts.

The original sentence is from the fourth mark in the first chapter of The Adventures of Sherlock Holmes.

Extended data:

The Four Signs is the second mystery novel by arthur conan doyle, a British detective novelist, featuring Sherlock Holmes. It was published in February 1890.

The story of the novel takes place between 1887 and 1888. It tells the story that mary morstan, a British lady, received an anonymous parcel every year after her father disappeared, which originally involved a conspiracy. This novel objectively exposes and reflects the British colonial activities in India.

Synopsis of story:

The Signs of Four begins with Sherlock Holmes' long talk about deduction: Holmes knows that Watson went to the post office in the morning and sent a telegram without knowing it; 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.

Baidu Encyclopedia-Four Signs