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You arrive at the airport.
After your conversation with the man in black, use the coin in your inventory on the vending machine on the left to get a SODA. Walk to the right and talk to the newspaper seller and try to get information about the murder. When you want to buy a newspaper you need some more money.
Walk further to the right and talk to the man waiting on the bus. Since he’s there a long time already, he might know something. Walk further to the right and a homeless man will talk to you. He has a notebook that might have vital information but he wants something to eat first.
Let’s try our hotel room first. Walk to the left and select the hotel on the map. Use the front door to enter and talk to the porter to check in. He’ll give you the KEY to your room. Use the stairs to go to the first floor and walk to the left to go to room 13. Use the PH key on the door to unlock it and see the inside of the luxurious apartment. On the floor you can find a SANDWICH that you can take. Use the door to the north to the bathroom and checkout the leftovers on the sink. Take the HAM from it. Leave the bathroom and use the door on the left to return to the corridor.
Walk to the right to go to the lobby and walk to the left to leave the hotel. Go to the left or right to return to the map and select the police station on it. Talk to the officer outside. He can’t tell you much and isn’t cooperative. Use the door to enter the police station.
Talk to the officer inside as well to learn there’s no one behind the counter. He also won’t let you talk to the captain. We’ll see about that. Use the door in the middle to enter the captains office and talk to him. Notice the window is open. Left of the officer is a photo booth. Push the coin return and something comes out. Use the tray to pick up the COIN. Leave the police station and walk to the left or right to go to the map. Select the airport on it.
Use the ham with the bread to create a sandwich and give it to the homeless guy. Now he’s thirsty. Give him the soda and you’ll get the NOTEBOOK. Look at it in your inventory but the information inside appears useless. Walk to the right and give the coin to the newspaper seller to buy a NEWSPAPER. Walk to the right, then to the left to go to the map and select the morgue on it.
Use the front door to find it closed. There must be a way to get in. On the floor is a HANDKERCHIEF. Pick it up and look at it in your inventory to see the initials. Walk to the right and go to Diane Kleiber’s house. Talk to the man behind the newspaper. He’s just waiting for the bus. Show him your flashcard and he’ll tell you about the office, the murder and the morgue. Talk to him again and ask him about the morgue. He can get you a key if you can make a mould.
Walk to the front of the house and talk to the officer. He isn’t leaving without a very good reason. He’ll tell you the captain is annoyed. Insist on talking to the officer and tell him about the notebook. Give the notebook to the officer and he’ll leave. Walk to the right and find the BRANCH under the window. Pick it up and walk to the south to go to the street and walk to the right to go to the map. Select the morgue again.
Look at the lock. That’s a big key. With what can we make a mould? You still have the melted plastic. Use it on the lock to make a mould. Take the plastic from the lock and there’s your CAST. Walk to the right and select the police station on the map.
Walk to the right of the building and look through the open window to make sure it’s the room of the captain. In order to get in there, he needs to get out. Use the branch on the window to put it under it. But the branch is to wet to burn like that so use the newspaper on the branch. Then use the lighter on it to create a smokescreen.
Walk to the left and use the door to enter the police station. Enter the office of the captain and use the desk to search the drawers. Eventually you’ll find the KEY. Leave the office and leave the police station. Walk to the left to go to the map and select Diana Kleiber’s house. Give the cast to Brian so he can make a copy and walk to the front of the house.
Use the key on the door to unlock it and enter the house. Go through the door on the right to enter the living room and look around. Not much to see. Use the chair to move it forward and use the rug to find the trapdoor under it. But it won’t open. Leave the room again and leave the house. Brian will call you and give you the KEY to the morgue. Tell him about the trapdoor and ask for something to open a padlock. He’ll give you a SCREWDRIVER. Return to the house, use the key on the front door and use the door on the right. Push the chair, fold the rug and use the screwdriver on the trapdoor to open it.
Use the secret compartment to take a PHOTO ALBUM out. Use it in your inventory to find a recent PHOTO of Diana. Leave the room, use the door to leave the house and walk to the south and left to see the map. Select the morgue. Use the key Brian gave you on the front door to enter the building. Use the door on the right to enter the office.
Take the GLOVES from the table and look at the notes on the message board on the left. They are doing a autopsy on a female in compartment 47. Leave the room on the south and go to the cooler on the north. Use compartment 47 to find the female. Use the photo on the body to identify Diana.
Use the body to examine her closely and find the cause of death and the marks. Use the drawer again to close it and walk to the south twice to leave the morgue. There’s that man again. He’ll tell you about the second murder and the name of the victim.
Game source: A copy of the game was found here  on the internet.