At night in Shenlan City, the most dangerous thing is not the rain or the gun, but the courier trucks traveling through the streets. Ye Hang, an ordinary courier on the surface, was actually a top criminal psychology consultant. A midnight delivery involved him in a series of murders and an internal frame-up. He was forced to find the truth under the triple pressure of the police pursuit, the murderer's silence, and the company's shady circumstances. Every express delivery is a clue leading to the abyss; every delivery is a brush with death. As the "clockmaker", the blue package, the abyss files and the old case from ten years ago surfaced, Ye Hang discovered that what he was delivering was not a courier, but the evidence and truth hidden in the blood vessels of the city.
