Step through the Archive’s blue portal onto a frozen wooden jetty in Birka, the busiest Viking trading town of the north, in the deep winter of around AD 900. Ships sit locked in the ice, smoke rises from rows of turf-roofed houses, and children glide across the frozen lake on skates carved from bone. Your guide is Eyvind, a gentle grey-bearded comb-maker who saws elk antler into combs so fine their teeth are cut with a blade as thin as a hair. While digging a new hearth in his workshop, he found an old comb buried in the dark earth, more beautiful than anything he has ever made and carved with a pattern he doesn’t recognize. He’d like to return it to whoever made it, one craftsman to another. Tonight the northern lights are out, and under their glow, Birka remembers: whenever the green ribbons brighten, the town around you shimmers into one of its own earlier winters, and the brighter the sky, the further back you go. Together you share honey bread by the fire, wander the winter market among furs, amber and silver from distant lands, and finally skate out onto the open ice to wait for the brightest light of the night. There you may find the hands that carved the comb a hundred winters before. Nothing chases you through the snow tonight, only green light, warm hearths and the quiet sound of bone skates on ice. It’s a calm, richly researched sleep story about craft, memory and a town built on its own gentle past, ending with a slow glide home and a long, peaceful winter’s night.