When old fisherman Hassan Ben Yaqoub pulls a strange bottle covered in mother-of-pearl from the sea on a stormy night, he unknowingly breaks an ancient seal meant to conceal untold horrors beneath the waves. Inside the bottle is a black scroll, mysterious salt crystals, and a warning:

"The door is open. Don't look for us. They are coming."

By morning, Hassan and twelve others have vanished without a trace, and their boats have returned—sunk, wrecked, and filled with evidence of a legend buried deep within Cape Toussaint's cursed history.

Enter Lama El Husseini, a brilliant marine archaeologist, to delve deeper into the unfolding nightmare. As she discovers the village's connections to a sunken port, forbidden maritime rituals, and a recurring pattern of disappearances every 44 years, she realizes the ocean hides more than just wreckage and relics—it guards a prison built to contain things never meant to surface.

From underwater bells and mysterious sea creatures to full moon awakenings and subtidal doors, Lama races to understand the truth before the next bell rings.

But as the 44 doors begin to open and ghosts emerge from the depths, it becomes clear:

Some secrets are destined to remain submerged.