You need a shower.
Use the door to enter the lounge and walk to the left, past the kitchen until you find four doors. Use the light blue one to enter the shower. Use the shower on the left to clean up and once refreshed leave the bathroom on the right. Walk to the right twice to enter the lounge and use the TV to watch some news.
You learn about the murder and want to check out the place. Walk to the right and use the red door on the right to leave the house. Outside you’ll meet the detective who’ll give you his BUSINESS CARD and tell you about the sign in the tree. Walk to the left to find the tree and look at the symbol. You’ll remember the clan Jack belonged to.
Walk to the right twice and use the door of the house in the back. Inside you’ll find Mark. Talk to him about the murder and then tell him the truth about your past. When you say goodbye, Mark asks you to get a book that Michael once borrowed. Leave the house using the door on the left and walk further to the right.
Enter the house with the red door to find Michael. Talk to him and ask him about the murder. Tell him the truth as well and the ask him for the book Mark wanted. Michael doesn’t have the book anymore and wants you to find it. Use the door on the right to leave and walk to the left twice to return to your own house. Go inside and use the blue door next to the entrance.
Look at the bottom shelf of the bookcases to discover the BOOK you’re looking for. Walk south to leave the room and use the door on the right to go outside again. Walk to the right twice and use the red door to go inside. Give the book to Mark and he’ll ask you to bring it to Michael. As thanks you can have is BASEBALL BAT. Use the door on the right to leave the house.
Walk to the left and use the door of the house in the background. Talk to Mark and tell him you got his book. You’ll give it back and tell him you’ll be staying at home tonight. Leave the house using the door on the left and walk to the left to your own house. Use the front door of your house and walk to the lounge on the left. Use the blue door to enter the bedroom. Use the bed to get some rest.
Waking up in the middle of the night, you want a drink so use the door to leave and walk to the left to enter the kitchen. Here you’ll find a masked man and he wants to kill you. Quickly walk to the right into the lounge and use the light switch next to the bedroom door. In the dark you can still see the attacker so hit him with the baseball bat as soon as you can.
Once he’s on the floor, use the door to the bedroom and open the wardrobe to get your MOBILE PHONE out. In your inventory use the business card on the phone to call the inspector. But when he arrives 10 minutes later, the body is gone. Use the door of the bedroom again to get some sleep.
The next day leave the bedroom and walk to the right. Use the front door to go outside and walk to the right. Walk to the right twice and you’ll meet the attacker again. Again he’s chasing you so walk to the left twice and enter your own house again. Inside walk quickly all the way to the kitchen on the left. The attacker has revealed himself by now. In the kitchen use the piece above the cooker to attack your opponent by surprise.
Game source: A copy of the game was found here on the internet.