In Chapter 4 of Stray you have to find 4 Notebooks for Momo to advance the story. This guide shows where to find all Notebook locations.
1. Momo’s Notebook
After talking to the first robot in Chapter 4, who is called “Guardian” (he wears a straw hat and has a staff in his hands), you will have to climb to the rooftops to find Momo.
From where you talked to Guardian, turn around and look to the right. You can jump the vending machine and the AC units on the house walls to get to the rooftops.
Go to the center of the rooftops where two robots are throwing buckets. There’s a small red roofing on the side of a house, jump there and climb the AC units to the balcony above. Jump through the open window to find Momo in the flat.
Talk to Momo and you will be given Momo’s Notebook. That’s the first of four Notebooks done. All other notebooks are in abandoned flats on the rooftops. They are all marked by a blue/white smiley icon on the house walls.
2. Doc’s Notebook
Leave Momo’s flat through the window and look to the right side. There’s a balcony with a blue neon sign, go there. The inside looks like a library with many bookshelves.
In the back are several stacks of books, jump over them to find a bed. Interact with the paper on the bag to get the Keys.
Leave the bedroom, turn left, between the 1st and 2nd bookshelf are more stacks of books, jump on them to topple them over, thus revealing a safe behind the books. Use the Keys to open the safe, inside you find Doc’s Notebook.
3. Clementine’s Notebook
Exit the library through the window you came in. Straight across from Momo’s flat is a blue apartment with the white smiley icon on its wall. Go over the pipes on the rooftops and enter through the window.
Inside is a wall with broken glass panels, you can squeeze through where the glass is missing. Then turn left to find a corridor with a computer at the end. The notebook is on the screen.
4. Zbaltazar’s Notebook
Leave the flat, go straight ahead over the pipes, back towards Momo’s flat. When facing towards Momo’s flat look right, there are 2 robots throwing buckets and behind them is another flat with the blue neon smiley sign. Go there.
On the rooftop you must pick up the battery on the left of the vents. This will stop the fan on the right of the roof. You can now drop down through the fan, where the orange light is coming from. You’ll land in the flat below.
In the flat jump the boxes to topple them over. The last notebook will fall out of these boxes. Just jump all of them and run through the boxes until the notebook falls out and pick it up!
To leave the flat, scratch the window blinds on the right side.
Return to Momo
Return to Momo where you got the first notebook. Give her the other 3 notebooks from your inventory to advance the story. However, be aware that after you give her the 3 notebooks you’ll get locked into the room with her, there’s no way back anymore. So if you have any unfinished Collectibles etc. here you should get them before handing Momo the Notebooks!
For more guides check out the complete Stray 100% Completion Wiki & Strategy Guide.