踏上屏東縣西南方的珊瑚礁島嶼小琉球，督察唐聿卻無福享受美景。因為那特立獨行的刑警李武擎，竟違背停職處分擅自脫逃。費盡心力追尋到此的唐聿，卻因一樁突如其來的離奇案件打亂了即刻將人帶回的計畫：在歷史悠久的白燈塔內出現姿態怪異的男屍，犯罪現場狀態讓案情瀰漫著難以言喻的詭異氣氛。 恰逢颱風來襲，小琉球停止了對外交通。李武擎與唐聿一行人只能暫且待在島上，履行身為警察的職責。然而白燈塔一案尚未結束，在西北角美人洞附近的海域又發現一具浮屍。 兩名被害者都是搭同一艘船來到小琉球的人，李武擎將嫌疑犯鎖定在同團的一對師徒，並透過一系列問話與證據查找，發現這對師徒不僅形跡可疑，且在小琉球地下進行隱密的能源研究。 儘管這項研究可能會對臺灣的新興能源帶來貢獻，然而長達二十多年卻一直沒有成果。而他們因研究奪走過無辜人的性命，此刻那些枉死的冤靈似乎和小琉球傳說中的烏鬼一樣，正在陰暗的角落窺視所有人的一舉一動，伺機報復。

“I am a specter trapped evermore in the darkness, seeing no way out and awaiting the flames of my hatred to lead me through.” The intruders' greed and arrogance will conjure up the specter in Samaji from the flood of history...... Stepping on the island of Xiao Liuqiu, a picturesque cay off the coast of southwestern Pingtung County, Police Inspector Yu Tang dashes around having no hesitation in finding Wu-Qing Li, a free spirit and criminal police officer under suspension from duty who is escaping from the punishment. Scouring this islet for him, Tang is faced with a bizarre murder. The male victim's body posture appears particularly odd inside the long-standing White Lighthouse -- this creates an even more mystifying atmosphere that surrounds the crime scene. “The water stains on the ground, you see -- they're the footprints of the water ghosts! ” To make matters worse, an unexpected typhoon comes to strike this place, disrupting all the public transportation. And another victim is now found dead, his body floating up and down in bloodred water of Dead Infant Cave, one of the legendary relics. Here is the location where the Lamey Island massacre happened in 1636, a large number of killings between Dutch sailors and aboriginal inhabitants. Is it possible that the dead have been awakened for the first time? Is this place haunted by evil spirits? Yu Tang and his partner Wu-Qing Li attempt to investigate the cases, and what’s been waiting for them is the story involved in the local history and a shocking twist of fate. The key to all the mysteries lies deeply buried in Black Dwarf Cave, the site of the island's great tragedy. Tang and Li have completely different characters. They have known each other since they were young. And they have kept hiding the pain from the past. From now on they must search for the missing link between now and then. And they will discover more truth behind the truth than they have ever imagined.