A companion novella to the original Mistborn trilogy that reveals what was happening behind the scenes – in the space between the Physical and Spiritual Realms – during the events of all three books. Contains massive spoilers for The Final Empire, The Well of Ascension, and The Hero of Ages, and minor spoilers for The Bands of Mourning. Sanderson himself warned that knowledge of this story's existence is, in a way, a spoiler. What can be said: this is the most Cosmere-connected work in the Mistborn saga, pulling back the curtain on the forces that shaped Scadrial's fate and revealing that there was always another secret. Best read after completing the original trilogy and The Bands of Mourning.