Immortal X-Men #8, titled "A Study in Cerulean," is a critically acclaimed, flashback-driven issue that acts as a crucial prelude to Sins of Sinister . Written by Kieron Gillen, the story blends Victorian mystery with foundational mutant history, focusing on Mystique and Destiny's confrontation with Nathaniel Essex. For a full overview of critical reception, visit Comic Book RoundUp . Immortal X-Men #8 review - AIPT