Former navy medic Wang Ping returned to the coastal city of Xingang City to work as a port first responder with a tactical dagger engraved with the name of his deceased friend. This city, built on the wreckage of a shipwreck a hundred years ago, is being shrouded in strange "drowning and disappearance cases" - the victim's lungs are filled with seawater but there are no signs of struggle, and fish-like red spots appear on the skin, and the last missing person is his childhood friend.
When Wang Ping found half a bronze compass fragment engraved with reverse tide patterns in the deceased's residence, and the moment he touched the turbid "amber eyeball" in his palm, the illusion of an undersea skeleton altar came to him like a tide: a human figure walked towards the deep sea on a metal frame, and an ancient ship's emblem entwined with octopus tentacles loomed in the mud. The retired professor's dying warning reveals a corner of taboo history - the crew of the "Black Tide" that disappeared during the British colonial period signed an eternal contract with the ancient god of the deep sea, the "Lord of Deep Throat", and under the foundation of Newport City, the heart of the dismembered captain and the sleeping giant are sealed.
