There are dragons lurking in the tunnels beneath Montreal's city streets - at least that's the rumor that confronts new metro driver Vanessa. Terrified by these mysterious and horrifying apparitions, the night shift turns to self-medication, losing the ability to tell the difference between reality and fantasy. Pulled in deep by the underground raves that blast through the system's abandoned stations, Vanessa quickly finds herself on the verge of crossing into a dark world she never knew existed.