The three of them quickly retreated to the reinforced safe room on the second basement level, where the most precious items in the collection were kept behind bulletproof steel-plated walls. Mu Feng locked the mask and the fluorescent chart into a safe, but as he turned around, his Mystic Pupil suddenly detected an anomaly: there were faint signs of wear along the edge of a floor tile in the corner of the room.
He crouched down and tapped the tile lightly with his finger, eliciting a hollow sound.
"There's something underneath this."
Chapter 141