The next morning, Ran was surprised to find unopened mail in their mailbox. Of course, since they were in a hotel abroad, it wasn't taxes. On closer inspection, she realised the letter was directed to her father. She returned to her room and decided to give it to the sleeping sleuth when he woke up. Speaking of which...

'oi oi, you'd think with all those tranquilizer darts he'd sleep less.' the sleepy eyed Conan Edogawa, previously known as shinichi Kudo, told himself as the old man snored.

Later that day...

"kon'nichiwa otu-san!" Ran greeted cheerfully

"Kon'nichiwa Ran."

"breakfast is ready in my room, oh and I found this in our mailbox."

"Arigatōgozaimashita" he thanked her, taking the letter out of its file and reading it. Suddenly, a wide smile crept up his face. "We're invited to a party hosted by Mr Wayne! Even the Americans know how important I am, HA hahahahahahaha ha!"

"Can I read it? Can I read it please? Can I ? can I ?" Conan pleaded as childishly as he could, and after months of acting, he nailed it.

"Sure, why not" he tossed him the letter, that floated in the air until Ran caught it.

"Here you go Conan-kun" she said as she handed him the piece of paper.

He read the letter, observing the neat grammar and sophisticated language. Whoever wrote this was well taught, it seems. The letter was from a Mr Wayne, owner of Wayne enterprises if memory serves. The party is at Wayne manor, all the important people will be there. He also noted that the party starts at 8 PM.

'weird... It's not common for Wayne to host parties... Or at least that's what I heard.'

By seven and a half in the afternoon, a lemousine was waiting for the three guests. Conan found it weird that the whole family was invited, Ran found it generous. Kogoro didn't really care.

By around eight, they had reached the manor, the house looked dark and dreary at night, like any building in Gotham, whether that was intentional or not was a mystery for another day.

The ball room was filled with Nobels of all types. Old and young, cruel and nice, wise and ignorant. There were some kids around too. But then there was that one guy. He had broad shoulders, stood tall, and seemed sure of himself. A deeper gaze from the little detective would describe his personality: brave, strong, ruthless...

That was when he accidentally dropped his cup.

"Oh, sorry, Alfred could you please..."

"Of course, sir" replied his British Butler.

So maybe he wasn't as heroic as he looked.

"Oh, Mouri-san! Nice of you to make it. I'm really honored you're here." He clumsily ran to the man, shaking his hand

"Oh no, the honor is all mine Wayne-san"

"Wayne-san, why did you call oji-san Mouri-san? All the other Americans call him Mr Miss Mouri." The inquisitive kid asked

"Oh, I'm familiar with Japanese. You see, I've traveled to Japan once to learn your martial arts."

"But don't you have dojos here in America?"

"Yes, well... I wanted to learn from the Masters. I wanted to be able to defend my loved ones against the most ruthless of enemies... But it was too hard. I got a pink belt..."

"Um, Wayne-San? Why is there a stage here?" Ran asked

"Oh, that. It's always there. That reminds me, I was hoping I'd introduce Mouri-san in front of all the guests on that stage."

"Oh, you're flattering me, Wayne-san." Kogoro replied, rubbing the back of his head while smiling.

"Well, let's go then."

Soon enough, the lights weakened, and spotlights focused on the stage.

"Ladies and gentlemen. I thank you all for attending today's ball. I know I don't do that much, but I couldn't help but notice a certain someone was in town and I want you all to meet him." Wayne spoke through the mic, his voice amplified "Please welcome Mr. Kogoro Mouri!"

"Thank you, Wayne-san..."

"AIIEEEeeeee!" A woman screamed, followed by noise and chaos. Those who didn't know what the commotion was murmured, those who knew panicked. All of Bruce, Kogoro, and Conan ran to the point of disturbance, and they were shocked to see a dead man.

Murder in Wayne manor!

Some minor edits here too.