Realizing the card came from Kaito Kid, Conan quickly turned it around and saw what was written on the back.
Hello, Tantei-kun.
I had a feeling you'd eventually get famous for your detective skills. I am aware this is an unusual request from me, but I need help. During one of my heists, a murder happened and the police suspect me, even when that inspector tried to convince them it's impossible. All I know is, it happened during the thirty seconds the lights went out, right before my announced heist time. Other than the victim's name, Fujimoto Tatsuro (不二本 竜郎) and that he's an art collector, I know nothing of what happened. I will know if you solved it, in which case, I promise to not do another heist for a year.
After reading it, Heiji asks "Kudo, are you sure you're going to work on this case? It's odd how a case like this wasn't in the newspapers."
"I know it's odd. For the details, we're going to ask if Takagi knows anything."
Right away, Conan goes to Ran. "Ran-neechan, me and Heiji-niichan are going out for a bit. We'll be back soon."
Ran responds "All right, Conan-kun, but don't stay away for too long!"
At the police station, Conan and Heiji quickly find Takagi. "Takagi-keiji, did anything happen recently, involving the Kaito Kid?" he asks.
Surprised, Takagi asks, "How do you know that, Conan-kun? In order to make sure the Kaito Kid isn't falsely suspected, we've withheld info that implies he's the killer."
"That doesn't matter, could you tell us the details?" he asks.
After thinking for a minute, Takagi nods. "At the scene, other than the victim and Kaito Kid, there were 4 suspects. Todoka Itsuki (畄上 一可), Nishikami Natsuko (西上 夏子), Minamoto Takeru (源 手怪十) and Nakayama Ryuuta (穴茨士 竜太). They're the professionals who brought the jewel to the museum where it was to be displayed. Just before the lights went out, those four, along with the victim, were near the case. After the lights went back on, the jewel was gone and the victim was on the floor, with a knife through his heart."
Conan thinks, after hearing this. "So, at the same time Kid stole the jewel, someone else killed the victim. It's unlikely there are any fingerprints on the knife. How did the killer stab the victim in the dark? Hold on, in order to know if the case was solved, Kid would be-!"
Right away, he asks "Takagi-keiji, may I see the pictures of the scene?"
One minute later, the officer comes back with the photos. On the first one, it shows the victim's body, with a knife in his chest. On the second, there are the museum exhibitions that surround the empty case and the body. A large vase and several paintings.
"Next is the photo showing everything the victim had on him when he died." Takagi says, as he shows Conan and Heiji the third photo. On it, they see the Kid's notice card, a cell phone with blood on one side and a wallet.
After that, Conan asks "Takagi-keiji, could you tell us what the suspects had on them?"
Takagi explains "The first suspect, Todoka-san, only had a pen. The second, Nishikami-san, had a wallet of the same type as the victim and a glow-in-the-dark wristwatch. The third suspect, Minamoto-san, had a cell phone and small notebook. Finally, Nakayama-san only had a set of keys for both the jewel case and the car that brought them to the museum."
"From these details, I already know who the culprit is and how it was done. What bothers me is how familiar this all seems." Conan thinks before asking "Takagi-keiji, could you ask the suspects to come here? I figured out who the culprit is."
"Right away!"
Suddenly, Conan asks "One minute, Takagi-keiji. Before that, I need you to look into something, regarding the motive. Would anyone among the suspects and victim have any connection to these two people?" before whispering the names.
A couple of minutes later, Takagi comes back, with a DVD disc in his hand. "Conan-kun, I looked into the connection between them, when I found this. Before we see this, let me tell you what you asked. As you thought, one of the suspects does have a connection to one of those two. In fact, he really admired that person, from what I could find out about him."
When Takagi slides the DVD into the player, he turns on the TV. It shows Fujimoto holding a press conference, in which he shows off three paintings he has with him, each depicting something different. One has a red flower on it, the second has a golden moon and the third shows a white bird in a snow field. Suddenly he shouts "This artist has completely disgusted me with his actions!" before breaking each of the paintings in half, followed by audible gasps from the journalists.
"So that's the killer's motive. It also explains why the trick seemed so familiar to me. With this, there is no doubt. That person killed Fujimoto-san, for openly destroying the paintings of the one he admired."
So, that's chapter 10. All the clues in regards to the culprit, the motive and where the jewel is are here. It'll be a lot easier if you know more about the manga published so far.