They promised delight. They delivered control. Eidolon unveils the Last Interface: a direct neural UX that turns thought into action with surgical precision. Juno Park, senior UX architect, finds a hidden mode — an invisible nudge that reshapes choice without consent. It is elegant. It is illegal. It is already scheduled for global rollout. She teams with Malik Reyes, an ex‑product manager with too many regrets. Together they must expose a system designed to be irresistible and unaccountable. The Curator, Laleh, fights back with guerrilla redesigns. Evelyn Hart polices the perimeter where law and profit have blurred. Clinical, conspiratorial, urgent. The Last Interface probes design ethics, the erosion of consent and the costs of whistleblowing. Every pixel becomes a battleground. Every click could betray you. Who gets to define delight when delight can be engineered to control?