Brook is diagnosed with slow-acting poisoning designed to look like a natural death, but the source remains unclear. Medical checks reveal his medications and fluids are safe, ruling out oral poisoning. When the new maid enters to deliver his nutrient shot, the doctor suspects she may be the culprit. Upon testing the injection, poison is confirmed, revealing a threat from within Brook's household. The doctor warns him about hidden danger in his family while preparing for their wedding night. Despite reluctance, the doctor indicates a tough but necessary decision must be made, leaving the episode on a tense unresolved note.