What's slithering about deep underground... ? When a meteorite crashes to Earth near Crooked Oak, Pete, Nancy and Krish are determined to find it. But they're not the only ones... After spotting one of their teachers up on the moor where the meteorite landed, they start to wonder if his strangely altered behaviour and appearance might be connected to the arrival from outer space. But nothing could prepare them for the horror they uncover deep down in Killburn Mine.
