A force-directed network graph visualizes character co-appearance data from *Les Misérables*, parsed from a plain-text edge list. Clicking a node reveals its label and updates the visualization, while clicking it again resets the view. The SVG rendering uses `d3.forceSimulation` with link, charge, and center forces, plus `scaleLinear` to map link weights to stroke width and opacity. Custom click, mouseover, and mouseout handlers control label visibility, and a `d3.zoom` behavior supports panning and scaling.