This page of the Dying Light 2 game guide has information on all possible romances available in the game.
Thalia is a woman you can meet in the library PK Floating Fortress. This is one of the safe zones in The Wharf region.
You will meet her during the Book Club side quest. She will have 10 tasks for you. Each begins with a conversation with her. Sometimes you have to wait for these jobs - usually, it is enough to go to sleep for the time of day to change. All the tasks are about running around the map and getting books, and sometimes there will be some fight. Each book club mission is described on separate pages of the guide.
- Book club 1
- Book club 2
- Book club 3
- Book club 4
- Book club 5
- Book club 6
- Book club 7
- Book club 8
- Book club 9
- Book club 10
After completing all 10 tasks, you need to talk to the woman. Thalia will invite you to her apartment, and you have to go there at night . This is a separate side mission called Turning the Page.
During the conversation, you will have a choice. You can stay with the woman for the night or go out politely. If you decide to get to know Thalia better, you will see a black screen and then a short cutscene during which the main character leaves the apartment in the morning.