At the heart of the Realm of Shadow, there lies a place of deepest dark. A cold and ancient labyrinth beneath the ocean bed, where strange halls echo with the sounds of death, and shadow-magics lurk in every nook and cranny. Whispers of its existence haunt the port taverns, along with a rumour that once dragged down to those watery depths, there is no hope of escape.
But there are those whose fate has already been sealed. A band of Stormcast-errant on a mission to discover the whereabouts of missing fleets; two pirate captains, vying for power on the seas; and a pair of priests on the hunt for a potent weapon. All have fallen prey to this sunken hell, and to survive, they must preserve their sanity. For those above will forget them – the wailing of the wind will smother their cries. And in every waking moment, all they will know is the horror of Harrowdeep.