1July 7, 887-At the beginning of the story, Holmes was injecting 7% cocaine solution. He has been doing this for some time. Watson expressed strong opposition to this. Mary morstan went to visit Holmes for help. Her mother died when she was very young, and her father was a British officer stationed in India. She hasn't seen her father for many years and was sent to boarding school many years ago. Later, her father asked for leave to go back to England. On February 3, she received a telegram from her father saying that he had arrived at a hotel in London and asked Mary to come over. But when she arrived at the hotel that day and wanted to reunite with her father and daughter, she was told that her father had left the day before her arrival and never came back.

Major Schulto is a retired comrade-in-arms of her father's regiment. He lived in London when her father disappeared. The two of them served together in the garrison on the island of Amman. 1on April 28th, 882, four years after the disappearance of Captain moston, Major Schulto died.

After Schulto's death, that is, from May 4th, 1882, Mary began to receive an expensive pearl on the same day every year.

1On July 7th, 887, the day she visited Holmes, she received an anonymous letter asking her to meet outside a theater.

Mary found a treasure map with four signatures among her father's belongings. They went to the theatre and were soon carried away by a horse to see thaddeus.

Thaddeus lives in a luxury apartment. He told them that his father brought back a lot of wealth from India, some of which should belong to Captain Mostain. When Captain Mostain arrived in London, he came to his father to clarify the matter. Before he died, Major Schulto told his two sons that he had a fierce argument with Captain Mustang because he had different opinions on sharing the treasure. Captain Mustang suffered from a serious heart attack and died of a heart attack in the process.

Thaddeus and bartholomew searched their home immediately after their father's death, but found no clues.

Finally, just a day ago, bartholomew finally found this treasure. Thaddeus hoped to give Mary a copy to make up for her father's mistake. Bacelo Miao reluctantly agreed.

When Watson, Holmes, Merry and thaddeus arrived at bartholomew's residence, they found that he had been killed with a stinger and the treasure was gone.

Children's songs stepped on pomegranate oil in bartholomew's laboratory, and Holmes began to pursue it with a particularly sensitive sense of smell. Toby finally took them to a pier by the Thames. Holmes found out that the target he was following rented a motorboat and left 24 hours ago.

Holmes asked Baker Street captain Wilkins to lead his men along the upper and lower reaches of the Thames to search for the Dawn. But they found nothing.

Holmes disguised himself as a sailor and began to explore for himself. He finally found that the missing ship was being repaired and learned that Moschi Smith and others would leave the shipyard at 8 pm. He contacted Jones and asked him to prepare a police motorboat on the other side of the shipyard to follow him when he left at dawn.

Dawn sails for the Esmeralda, which is preparing to sail for Brazil.

The police motorboat caught the dawn. In the process of chasing, the Andaman native once blew a stinger at Holmes and Watson with a blowpipe, and was shot by Holmes and Watson and fell into the river.

Watson took the treasure chest to see Mary. But when the box was opened, I found it was empty. Because at this time, the obstacle formed by their huge "wealth" has disappeared, Watson summoned up the courage to propose to Mary, and Mary agreed.

It turned out that when Smallville found that he was about to be caught up by the police, he had scattered his treasure in the Thames about five miles long.

Smallville told Holmes and others his own story:

He used to be a soldier of the British army in India. Due to a series of changes, he finally came to a castle in Agra during the "Great Rebellion". He and three Sikh soldiers killed a servant of the Turkish king and stole the treasure he brought.

Schulto and Mostain were officers in the prison at that time. Smallville made an agreement with the two of them to tell them where the treasure was hidden if it could help Smallville and the other four escape. But Schulto deceived smoot, Mostein and others, and he returned to England immediately after he got the treasure.

The small job is to help prison doctors, so he also learned some medical knowledge. Once, he found that a local named Tongge was seriously ill and dying. Under his careful care, Tongge slowly recovered. In this way, they became best friends. Tongge has a boat that Smallville used when he escaped from prison. It took smoot and Tong Ge several years to get back to London. Because Major Schulto hired someone to watch him closely, Smallville had no chance to get close to him until his death.

The story of "Four Signs" is over. Watson will marry Mary happily soon. Holmes is addicted to his cocaine bottle because he has no case to solve.