Notebooks are a quest item that you must obtain from certain locations to progress the main story in Stray.
Stray – All 4 Notebook Locations Guide
After meeting Momo and knowing that there are outsiders leaving the slum, you will be given a task that prompts you to track down their notebooks. The reason he wants you to recover those notebooks is because his transceiver is defective.
As such, he has no way to contact them, who happen to be his friends.
These notebooks will contain a note that Momo needs to fix her device. However, these notebooks are scattered in different places, and if you don't know where to find them, this guide is for you.
