Susan didn't answer immediately but pointed to the data on the projector, "The suspect Darcy bought 10 liters of blood plasma in January, and the amount increased gradually in February, March, and April. Why did the purchase volume drop back to 10 liters of blood plasma in May?"

Luke said, "That's something I was also wondering about, and the blood bank manager wasn't very clear either.

My guess is either he found a new source for purchasing blood plasma, or a new competitor emerged."

The deputy chief asked, "If Darcy is related to the death of the female singer Angela, then what is his motive?"

Luke replied, "Angela was the most famous vampire-themed singer with numerous crazy vampire fans. Is it possible that Darcy wanted to use Angela for promotion to expand his blood plasma sales territory?

In this aspect, Angela would definitely be the best spokesperson.

And from the current situation, Angela had grown tired of vampires and didn't want to create songs on vampire themes anymore, essentially cutting ties with Darcy, who killed Angela in a fit of rage."

The deputy chief pondered, "Can selling blood plasma be that profitable? Moreover, even if Angela didn't cooperate, there was no need to kill her."

Luke speculated, "If Angela had been shot, I might not suspect Darcy.

But the manner of Angela's death is too strange, a vampire-themed singer killed by a vampire. This story would definitely become news and might even spark a vampire craze.

If the case goes unsolved, it'd become a hot topic of conversation.

As long as the vampire fan community grows, more people will buy blood plasma.

And the size of the profit chain varies from person to person; for those at the bottom, it's definitely a lucrative industry." Luke then seized the opportunity to suggest,

"Captain, I'd like to interrogate the suspect August from the Dracula Bar homicide case to see if he knows Darcy."

The deputy chief shook his head, "It's useless, August is determined to undergo a mental evaluation in the hopes of dodging legal punishment citing mental issues."

Luke insisted, "I want to give it a try."

The deputy chief retorted, "Are you doubting my interrogation skills, kid?"

"OK, I'll arrange the task."

Susan interrupted their conversation, "Looking at the current situation, Darcy indeed has significant suspicions and likely had direct contact with the deceased Angela.

Raymond and Jenny, investigate Darcy's alibi.

Deputy chief, David, continue following the trail of the blood pattern.

Luke, Marcus, you are in charge of interrogating August."

"Yes, captain."

...

The next morning.

Robbery and Murder Department interrogation room one.

The suspect August from the Dracula Bar murder case was shackled to the interrogation chair, with his lawyer Port sitting beside him, whispering to one another.

"Creak…"

A door sound, and Luke and Little Black entered the office.

Little Black greeted first, "Hey, August, how's living in the new castle treating you?"

Lawyer Port warned, "Detective Marcus, please do not provoke my client. Although I like you very much, I would still sue you."

Little Black rolled his eyes, "Lawyer Port, I like you a lot too, and if I saw you on the street, I'd definitely punch you."

"OK, you have a very friendly way of greeting. Let's get started with the formal interrogation," Luke sat behind the interrogation table, sizing up August,

"Sorry, we've been busy with another case the last couple of days and nearly forgot about you."

August showed a hint of joy, "I heard from Lawyer Port that there's been another vampire murder, and the victim was a well-known singer.

I was already in custody at that time, doesn't that prove I didn't kill anyone, and that the real murderer is someone else?

The Dracula Bar case could also be his doing."

Luke said, "I'm here today precisely to prove that point. If you believe you're innocent, cooperate with my investigation and don't hope to escape legal punishment through so-called mental evaluations."

Lawyer Port countered, "Detective Chief Luke, my client does have mental issues and is not simply trying to escape legal sanctions as you suggest."

"Come on, Lawyer Port, we're well aware of whether August has a mental issue or not. If he tries to fake it in this respect, the police will not consider offering him a plea deal.

And once it's determined that he is mentally sound,

Yet tried to avoid legal punishment by claiming mental issues, this act would also serve as unfavorable evidence in court.

You're well aware that judges and juries despise deception the most.

The outcome doesn't need to be spelled out by me." Luke said this and looked at August again, "My advice, if you think you are innocent, assist the police in their investigation, and recount the details of what happened at the time of the incident.

If we catch the murderer, it will naturally prove your innocence."

August looked towards Port with a hopeful expression.

Luke continued, "Alternatively, even if I can't prove your innocence, it doesn't affect the possibility of undergoing a mental evaluation.

Think about it, there's no loss for you."

August and Port exchanged a few quiet words.

Afterward, Lawyer Port declared, "My client is very willing to assist the police investigation, but I would like details about the other murder case first, as my client might provide some leads.

Of course, if you make unreasonable demands, I will promptly intervene."

As for Port's intentions, Luke could guess a few, the other case was definitely unrelated to August. It didn't directly affect August, and any influence it might have was positive.

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