It's time to start a routine investigation. First you're playing as Carla. Enter the diner.
Talk to the cop. Of course you can't ask all the questions, so choose what you want. Talk to the waitress and then have a little chat with other policemen.
You can help Carla to feel better, just drink some coffee (+5%). Now it's time to look at the table where Lucas was seating. Under the table you will find a book, The Tempest, by Shakespeare (+10%).
Use the phone (+5%). You can also go out of the diner through the back door and talk to the homeless guy. Trying to go back through the back door (-10%). Go near the cab, Carla will get an idea that maybe the killer took a cab (+10%).
Go back to the diner and enter the restroom. Look at the body and the mop. Go into the first toilet on the left. Look at the blood on the floor (+5%). If you didn't hide the knife in the first chapter, now it's on the floor, so go and look at it (+10%).
If the knife is hidden, switch to Tyler and go into the first toilet on the right. Flush it and you will find the knife (+10%). Now you can grub in the trashcan and look at the washbowl.
Look at the body. You can use urinal (Carla -10%). Now go out of the restroom. You can make a phone call (+5%) and drink some coffee (+5%). Have a little chat with other policemen (+5%) and look at the table where Luca was seating.
If you want you can turn the jukebox on (-5%). You can also go out of the dinner and talk to the homeless guy (-10%). Trying to go back to the diner through the back door (-10%).
Now talk to Carla and you will go out of the diner. Head back to the car and you will leave.