The detective Daniel Cross finds an abandoned subway station that lies underneath the city while he is investigating an unusual case of disappearance. All the objects inside were left in haste, forgotten baggage, expired tickets, and belongings. In his search through the price tags passages, the empty system, and underground tunnels, he usually finds the clue on the very night when the last educated leaves the stage nine-nine.
What happened to those humans? He chooses the road to go deeper into the mystery.