When a late-night detour collapses beneath them, four friends are swept into a living labyrinth under the city where rats herd, watchers keep the feasts, and a machine-cathedral-the Throat-speaks in the voices of the people you miss. Carved warnings ("Don't follow the voices") come too late as the maze delivers them from terror to ritual. One by one, hope is priced. With a love that won't let go and an ending that might, SINKHOLE turns urban legend into industrial horror-and asks what the city is willing to swallow to keep its streets quiet.