How much can a reader tolerate in terms of stretching what is logical? This is something that all writers must consider, but often the extreme boundaries of that leap of faith are determined by the genre.
For example, in fantasy we expect unimaginable things to happen. We yearn for magic, magical beings, unusual occurrences, strange environments. If these elements are missing, then the story might lack tension.
Contemporary fiction, and even historical fiction, needs to be grounded in reality of readers will not believe the story.
What happens when reality is so extreme that it seems impossible? Readers must take a leap of faith.
Your task is to write a story that pushes the bounds of reality, but that remains believable.
Have fun with this one.