The copper bells of the gold shop rang in the rain, and Tang Ren's crocodile leather shoes got stuck in the revolving door. Su Chen took the opportunity to scan the access control system and found that the alarm device actually used a magnetic stripe lock from a Hong Kong gold shop in the 1970s. "Get out of the way!" He pulled the copper coin string from Tang Ren's belt, inserted it into the keyhole and gently stirred it - this was the antique lock-breaking technique he learned at the Criminal Investigation Academy.

Qin Feng shone his flashlight towards the display cabinet and suddenly stuttered, "Three...three o'clock!" The golden Buddha ornament in the glass cabinet was only the size of a palm, but the angle of the lotus base was exactly the same as the stolen Buddha statue. Tang Ren approached with his broken heel, his nose almost touching the glass: "Placing gold in Xun Palace is a trap to rob people of their wealth!"

Su Chen used a laser rangefinder to scan the counter layout, and the holographic projection showed a strange energy distribution: "The gold objects are placed in a Faraday cage effect, and they are blocking some kind of signal." He suddenly squatted down and rubbed the gold powder in the gaps between the floor tiles with his fingertips - the nano-scale gold particles were forming a closed-loop circuit.

"Look at this!" Tang Ren had slipped under the workbench at some point, holding up a crucible with burn marks on it, "The 'alchemy of burning gold' mentioned in The Secret of Heaven!" The residue on the inner wall of the crucible glowed bluish-green under ultraviolet light, which was the refrigerant in the ice crystals in the exhibition hall.

Qin Feng suddenly grabbed Su Chen's watch, and the shadow of the ventilation duct was reflected on the surface. His neck veins bulged, and he struggled to squeeze out words: "Pipe...the direction of the pipeline...is...in the navigation system!" The three-dimensional map of the room was instantly displayed on the panel, and the ventilation system really formed the geometric pattern of a marine navigation system.

When the secret door was revealed behind the cutting machine, Tang Ren was using a flintlock to smoke the keyhole with sulfur soap - this was the old-fashioned way for the old locksmiths to deal with electronic locks. The thick smoke triggered the fire sprinkler, but accidentally washed away the fake repair layer on the door, revealing the 1946 Nanyang Shipping Company logo.

"Stand back!" Su Chen stopped Tang Ren who was about to kick the door, and used a thermal imager to detect the space behind the door. In addition to the outline of the shelf, there was also a cylinder that continued to heat up - it was a modified version of the liquid nitrogen tank that was stolen from the Antique Exchange.

On the CNC engraving machine in the center of the secret room, the semi-finished Buddha head was shining coldly under the laser. Qin Feng took out the face scanner, and the pupils behind the lens shrank: "3D...3D modeling data...comes from the museum security system!" He checked the staff file and found that the face of the workshop's chief technician was similar to that of the cold storage manager, Wang Qi.

Tang Ren suddenly wrapped the Buddha's head with gold foil: "Quick! It's time to tell fortunes!" The nano-coating produced a chemical reaction under the precious metal wrapping, and a string of binary codes gradually appeared at the position of the Buddha's eyes. The coordinates deciphered by Su Chen pointed directly to the Chao Phraya River pier, where a tourist cruise ship imitating the treasure ship of the Ming Dynasty was parked.

In the rainstorm, Tang Ren's gold-threaded Tang suit was soaked with rainwater, splashing water with every step he took. He took out a compass-shaped anti-wolf alarm: "There is heavy moisture at midnight, this thing can..." A sudden shriek startled the night heron, and the searchlight on the cruise ship's deck came on.

As the three of them lay prone on the wet deck, Qin Feng reached into the secret compartment of the lifebuoy and found a key. The wear marks on the key teeth matched the binding holes of the "Hai'an" logbook perfectly. Su Chen's portable mass spectrometer hummed, and the golden powder at the seam of the deck was the nano-coating in the secret room of the workshop.

The freezer deep in the cargo hold suddenly started up on its own, and frost crawled on the glass door in the shape of a lotus flower. Tang Ren pressed his ancestral stethoscope against the door and said, "The thing inside is reciting the Diamond Sutra!" Su Chen tuned the sound pattern and found that it was a looping Morse code - "19460716".

When the freezer door was opened by an acetylene welding torch, a bronze safe stood in the surging white mist. Qin Feng's flashlight illuminated the keyhole, and his pupils suddenly contracted - it was a composite lock that required the input of both a modern password and a Ming Dynasty mortise and tenon mechanism.

"Zhen is wood, Kan is water." Tang Ren bit the flashlight and sprinkled the Five Emperors' coins on the box. "The first digit of the password is 3!" Su Chen translated the position of the copper coins into numbers, and Qin Feng pressed the last key with trembling fingers. The damp air in the box surged, and the 1946 ship ticket and the contemporary Buddha head design were quietly juxtaposed.

A whistle suddenly blew on the river, and the searchlight pinned the shadows of the three people to the wall of the cabin. A lame old man walked in the dark, with the watch chain in his hand flashing the faint light of "HP": "After seventy years, I finally waited for someone who can unlock the double locks." His leather shoes rolled over the boat ticket, revealing the tattoo on his mechanical prosthesis.