On this page of The Quarry guide, you will find the walkthrough of chapter 8. You will learn what you need to do to complete this part of the game and unlock the Chapter 8 achievement.
After you finish Laura's story, you will switch to Ryan. You can trust the woman or you can openly voice your opinion.
Even if Ryan disagrees, he and Laura will end up in the quarry. You may find secrets there: the Scarred Flesh proof, The Lovers tarot card, the Wheel of Fortune and the Old Quarry Tools and the Miner's Lunchbox clues.
No one can get hurt in the quarry.
After taking control of Kaitlyn, you will find Emma (if she is alive). When talking to your friends, you may gain in Dylan's approval if you ask him for help. If Abigail and Emma are alive, they will stay in the basement.
You will once again move to Ryan and Laura. They will explore the basement of the Hackett's house. You will find the Rum Still clue and The Empress and The Emperor tarot cards.
You will end up in a part of the basement with cages. If you don't want Nick to die, you must forbid Laura from shooting the werewolf. If you want to save Jacob, you must disable the switches properly. First 1 and 2, then 1 and 4. Whatever you do, Laura will still end up up upstairs with the members of the Hackett family.