3.5 stars rounded up to 4 for the strong beginning and middle but weak end
The book started out strong, but I felt like the author lost a bit of her steam by the end and it felt pretty rushed.
This novel has all the elements that I love to see in a detective danmei, including a smart MC and a snarky ML surrounded by a cast of goofy characters with their own distinctive personalities and a formidable enemy with unusual powers. However, the final fight between our main characters and the bad guy was very anticlimactic, and even leading up to that point, I was already disappointed in how the author had weakened the bad guy.
The story takes place in a world with special human beings living side by side with regular humans. The most common of them are the sentinels and guides, who also have a spirit animal they can call out or force away at will, but there are also vampires, werewolves, snowmen, mermaids, and half zombified people, underground people, and more. The "sea area" in the book name refers not to a physical sea but to a the spiritual/mental realm of the sentinels and guides, and our main character Qin Ge is a psychological adjuster responsible for guiding "sea area" issues in other folks. He's one of the 5 certified adjusters in China and can "deep dive" into the sea areas of other sentinels and guides to check whether their mental state is abnormal and even view their past memories.
At the very beginning of the story, Qin Ge is taken from his beloved archives in the Crisis Management Office, which was created to regulate and protect special entities, and made the head of the Department of Psychological Adjustment. He has 3 employees under him to start, including the ML, Xie Zijing, a sentinel who was transferred to the main branch of the Crisis Management Office from the Western Division. Their first meeting is hilarious, as Xie Zijing breezes into the office and claims to be Qin Ge's ex, even though the latter has no recollection of him. So you know someone's lying, or at the very least, something's off.
The story is broken up in different arcs as their department is pulled into investigate various instances that require Qin Ge's help. For example, the first arc follows a doctor who claims to have visions of babies crawling out of the walls of an operating room, and the second arc is about a guy who has issues with family recognition and decides one of his female neighbors is his younger sister and goes to great lengths to stalk/protect her.
The cases themselves weren't super interesting compared to other mystery novels I've read, but there is an underlying thread connecting most of the cases that was intriguing and kept me going. One way or another, most of the cases are related to the deaths of Qin Ge's parents and Xie Zijing's parent's disappearance from 10 years ago, when there was a mysterious incident at a dried up well called Luquan, so I enjoyed seeing the threads eventually connect and lead to the truth of what happened in the past.
I won't go too much more into the story, but the last thing I wanted to touch on was what I mentioned earlier about the later part of the story losing steam. For most of the story, the bad guy, once we figure out who he is, is portrayed as a pitiful figure who had a bad childhood. However, he had a strong and unique mental ability to enter other peoples' sea areas and cause them extreme pain or pleasure, and in their moment of weakness, use the opportunity to implant suggestions in their head. With this ability and the lack of morals from his upbringing, he does all sorts of terrible things to manipulate other people and bring them under his control. However, by the time our main characters actually confront him face to face for the first time at the end, he's severely weakened and barely presents a challenge. It wasn't a satisfying ending imo.
Most of the side characters were well fleshed out on their own. I loved Tang Cuo's panda spirit animal and Bai Xiaoyuan's ability to produce thousands of sand cats for reconnaissance but only when she's drunk. What I thought the story didn't need was so many pairings. Both Tang Cuo and Bai Xiaoyuan develops their own love interest, and even Tang Cuo's sister comes into the mix with her own boyfriend. Honestly, it felt like there were too many side characters, and eventually when I was reading, I'd have to really stop and think about who was who.
The romance was just okay. I thought it started on a promising note since Xie Zijing sweeps into Qin Ge's life claiming to be his ex-boyfriend, but their dynamics didn't prove to be as entertaining as I had hoped. It was enjoyable reading about them starting to trust each other more, like when Qin Ge told XZJ about his parents' death or how Qin Ge is able to see more and more in XZJ's damaged sea area, but overall I didn't think the romance was the star of the story in any way.
This was a very satisfying read. I pretty much have nothing to criticise in this story.
The world building was excellent - when the story started mentioning other non-humans, and many of them at that, I worried that the story would be too 'crowded' with unnecessary details, but nope, they helped to form a complete world, and I appreciated how nothing felt superfluous.
Special mention had to be made for the side characters. In a lot of other stories I read, the side characters only served to give explanation, or to highlight how amazing the MC was. Not this one - the side characters here were each their own person, with life and personality independent of the MC, with their own strength providing what MC lacked. In other stories, whenever the story switched to the side characters, I wished it'd go back to the MC's POV soon... in this story, I enjoyed reading about the side characters as much as I enjoyed reading about the MC. At some point, I was even more invested in the side characters' relationship compared to the MC.
The relationship between the MC and the ML was also well written. It was a gradual thing, and it simply felt natural - there was no questioning "how did he fall for this character?". It was just... wonderful. It developed naturally, and it's a compliment that they're simply 2 people who fell for each other. There was no unnecessary drama or 3rd wheel barging into their life, they're simply 2 people trying to make a relationship work, and I can't emphasize enough how wonderful that is in a story like this.
There was no unnecessary gratuitous violence either - when the antagonist met their end, there was no "payback for all the crimes committed" - no fair vengeance, it's even almost dismissive of the antagonist's fate - but even then I got the feeling of, that's what life was like, not everything is fair and just, and I was most surprised by how I didn't feel unsatisfied about it.