Some maps lead you home. Others lead you to ruin.

When reclusive cartographer Caelan Thorne is hired to chart the uncharted — the Hollow Sea — he knows it's a death sentence. No ship has ever returned from its black waters. Time bends in its mist. Sailors lose their names. Memories slip like tidewater through clenched fists.

But the pay is too good to refuse... and the woman who offers it, Lady Veridia Cael, isn't just searching for a map — she wants her brother, the missing prince, brought back alive.

Aboard the Vesper, Caelan joins a crew of outcasts and mercenaries, each hiding secrets deeper than the sea itself. As they sail further from the known world, haunted by visions and hunted by monstrous things that shouldn't exist, Caelan begins to recover lost fragments of his own past — a sister taken by the sea, a voice that still calls to him from below.

The Hollow Sea is not what it seems. It's not just water. It's a memory. A mind. A god.

And it's waking.