Well, without more context, it's difficult to tell the exact 'beautiful strangers full story'. However, generally speaking, it might be a narrative that focuses on the allure and mystery of strangers. Maybe it's about two people who cross paths briefly, share a moment of connection, and then go their separate ways, leaving a lasting impression on each other.
Some free novels that might fit are classic ones. For example, 'Great Expectations' has Estella, who is a beautiful stranger in Pip's eyes. She is cold and distant at first, but he is drawn to her. There are also many free e - book versions available online. Additionally, 'The Scarlet Letter' has characters that can be seen as strangers in the context of the strict Puritan society. Hester Prynne is an outcast, and Arthur Dimmesdale has his own secrets, and their relationship is central to the story.
In 'All of Us Strangers: A Ghost Story', it might explore the theme of isolation among strangers and how a ghostly presence breaks that isolation. The ghost could be a symbol of something that forces these strangers to interact and face their fears. It could also be set in a particular location that has a haunted history, and the strangers are drawn to it for different reasons, but end up being part of the same ghostly narrative.
One common element is the exploration of the characters' inner thoughts. Since the movie has complex characters, fanfics often delve deeper into what they might be thinking at different points in the story.
I'm not sure exactly who the main characters are without reading the novel. But they could be individuals who are facing some sort of personal crisis related to the themes of being a stranger, like perhaps someone new to a city or a person who has lost their sense of connection.
The main theme could be about isolation. The characters might be strangers not just to others in the story but also to themselves, exploring how they navigate a world where they feel disconnected.