Sumet, a captain in the police force, and Plangpit are your average couple but with a problem in bed caused by the stress of his job. One day, a disabled writer named Tossanai moved next door. Plangpit befriended the neighbor, but her husband is jealous and got into a big fight with her. One day, when he got home, he did not see his wife. While looking for her, he smells something foul coming from the well behind his home. In it, he saw a dead dog at the bottom of the well. He returns to Tossanai's house, but no one was there except for the wheelchair and a computer. He read the novel on the screen, which resembles his life, and at the end of the story, there is someone following the ant. He then follows the trail of the ant and found his dead wife. Who is her killer? Is he able to close the previous 2 cases, and what happened to Tossonai? Why did he lie about his disability?