The TARDIS lands somewhere completely unexpected - not the bustling alien market you planned, but a quiet, fog-shrouded Victorian London street. Clara adjusts her modern clothing, feeling conspicuously out of place as gas lamps flicker in the mist.
The TARDIS brings you to Coal Hill School where Clara once taught, but something's terribly wrong. The children are acting strangely, and the classrooms feel haunted by something not quite human.