General Alternatives:
* Within the narrative
* In the tale
* Throughout the account
* As the story unfolds
* In the plot
* In the text
* Within the fictional world
* Within the framework of the story
More Specific Alternatives:
* At this point in the story: (If referring to a specific part)
* Towards the end of the story: (If referring to the end)
* Early in the story: (If referring to the beginning)
* As a character in the story: (If referring to a character)
* According to the story: (If stating something based on the story)
Informal Alternatives:
* In the book
* In the film
* In the movie
The best alternative depends on the specific context of your sentence. Consider the tone and style of your writing when choosing a replacement.