Dr. House's supplier is a middle-aged man with a big belly. He is not as clean as Dr. House and it seems that socializing has caused his body to age prematurely. The man's name is Joe.

"I swear, he was still healthy when I met him. He talked to me about the price of some medicines. As you know, factories have been developing very fast recently. Some brands of pharmaceutical factories have been working overtime to produce a large number of drugs at low prices. The medicine bottles I supply here seem to be expensive. I need to explain this to him."

This is what Joe said when he saw Trist.

"When I left the clinic, he was about to close. He said he had something else to do tonight. I asked him casually, but he didn't say it clearly. But I guessed he might be going to a party or meeting a woman because he kept himself very clean. You know, he was usually very clean, but he was even cleaner that day."

The middle-aged man with a fat belly took out a handkerchief to wipe his sweat. The air near the pharmaceutical factory was humid, especially in the morning.

“Is there a list of the medicines supplied?”

Drizzt inquired.

"Here, all here. He doesn't buy many kinds of medicine from me."

Joe pulled out a list, a list of his most recent transactions with Dr. House.

Trist took a look and found that they were indeed common medicines, mostly used to treat gastrointestinal diseases, injuries, lung diseases, common colds and fevers, etc.

In Gray Lane, these symptoms are the mainstream.

"You're not providing some illegal drugs."

Drizzt didn't mince words.

"No, of course not, I never do such things."

The man wiped the sweat from his forehead.

"But we found some less-than-legal drugs in Dr. House's clinic, like this..."

Drizzt pulled out a small bottle of illegal drugs that was placed on a shelf in the darkroom.

The expression on Qiao's face became more serious. He looked at the medicine bottle carefully and immediately defended himself.

"This drug is not provided by me. This kind of drug may not be available even in hospitals, let alone medical representatives like us. Only certain bigwigs can control the channels for it."

"Big man, you mean the Catania family?"

Drizzt took back the vial.

"I dare not say it. I know House is still close to many people, but I advise you not to get involved in what's going on over there."

The middle-aged man shrank his neck.

"Is there anything special about Dr. House during this time?"

Lu Ban suddenly asked.

"Whether it's words or actions, or the types and quantities of goods purchased, or anything else you feel is fine."

"Him? He hasn't changed much. He's just like that, meticulous and seemingly inhumane, but sometimes he seems like a good person. As for the incoming goods, he recently bought more medicine for treating lung diseases. I guess the workers in the factory are gradually getting sick."

When Joe saw that Trist and the others no longer asked him about his medicine, he sat up straighter and was no longer so collapsed.

"Oh, these businessmen are really smart. They let those homeless people work in the factories and rely on them to make profits. The workers' bodies will be weakened by the exhaust gas and they will need to buy medicine for treatment. The wages paid will go back into the pockets of the businessmen..."

As he spoke, he noticed the looks from Drizzt and Xia, and immediately shut his mouth obediently.

"Doctor House treated those workers for free?"

Trist recalled that when he was looking through the files before, most of them were middle-class people with some money, and there were almost no workers. Thinking of Dr. House's reputation, he asked.

"That's probably the case. Sometimes he would go to the factory area and give out some lung disease-relieving drugs to the workers for free. I don't know what he was after. Maybe doctors always have some aspirations, which is different from businessmen like us."

Trist asked the medical supplier for his alibi, etc., compared it with the police investigation, and then left his house.

“The air here is very fresh.”

Lu Ban walked out of the house and took a breath.

“There’s always a bad smell in the room.”

"agree."

Shia nodded as well.

"You two..."

As Drizzt spoke, he also patted his clothes, as if to shake off something dirty.

"It seems that he had no reason to kill Dr. House. Moreover, according to the pattern of the case, he is the last person to see Dr. House, so he is the most suspicious, so the possibility of committing the crime is the smallest."

"That makes sense. Next, shall we go see the two patients?"

Lu Ban asked.

"I need to go to Lady Martina first, maybe you can wait for me across the street?"

Drizzt subconsciously touched the pistol hanging under his armpit.

"No problem, we'll have a nice meal and wait for you."

Lu Ban had no objection.

Trist touched the medical records in his arms. He brought Lu Ban and Xiaya to the street corner and asked them to wait in the restaurant. He took a rickshaw and went through two streets before arriving at a store selling musical instruments.

The owner of the music store was playing the violin. When he saw Trist, he didn't say anything, but just pointed behind him.

Trist walked through the music shop and came to the room behind the shop. There were two men in suits sitting there. They were smoking, filling the room with the smell of cheap tobacco.

When they saw Trist, the two men stood up slightly, put out their cigarettes, and became more polite.

"This is what Lady Martina wanted."

Trist handed the file in his arms to one of the men.

"You haven't opened it yet?"

The man glanced at the file.

"Nonsense, if I hadn't opened it, how would I know that this was what she wanted..."

Drizzt felt that these gangs really needed some public education.

"Oh, okay, we'll give this to Madam. As for the reward, Madam said it's here."

The man pretended to glance at the file, but Drizzt knew very well that neither of them could read, so it would be reassuring to have illiterate gangsters like these deliver the documents.

What he handed to Drizzt was an invitation.

"The charity dinner tomorrow night?"

Trist did not ask the two people, he knew that they were just passing the message.

It seemed that Madam Martina wanted to let herself attend this charity banquet and test him in person. If there was no problem, she would give him the money and leave. If there was a problem, then...

After putting away the invitation, Trist returned to the music store.

He saw the owner of the musical instrument store sitting on a chair with two tall thugs standing beside him. The thugs held the owner down and prevented him from leaving.

On the other side, the violin that was just in the boss's hand was now in the hands of a young man. He played the violin and played a classical melody.

Trist did not curse, nor did he leave at the speed of light. He saw the car outside the music store, and he knew very well that if he acted rashly now, the crisp sound of the typewriter would surely be waiting for him.

After a moment, the young man put down the instrument in his hand and glanced at Drizzt who was motionless.

"Hello, Detective, I have a business I want to discuss with you."

For some reason, the young man's face looked familiar to Trist.