The phrase "central mystery" refers to the main unknown or puzzle at the heart of a story, event, or situation. It represents the key question or problem that needs to be solved or understood. Full definition
Discuss with students, both during the exercise and afterward, how the story's central mystery evolves throughout the book, using the chart as a reference. (booklistonline.com)
The various theological controversies of the early centuries of Christianity — regarding our understanding of the two central mysteries of the faith, the Incarnation and Trinity — saw the question itself first deepened and clarified, and then answered with philosophical rigour. (faith.org.uk)
The script's central mystery revolves around the automaton: Who made it, what message it gives when it is repaired, how Isabelle wound up wearing the key that starts it in motion around her neck. (markreviewsmovies.com)