As Langdon stood up, Fache walked over to the spotlight and turned it off. The gallery plunged into sudden darkness.

Momentarily blinded, Langdon felt a rising uncertainty. Fache's silhouette appeared, illuminated in bright purple. He approached carrying a portable light source, which shrouded him in a violet haze.

"As you may know," Fache said, his eyes luminescing in the violet glow, "police use black-light illumination to search crime scenes for blood and other forensic evidence. So you can imagine our surprise..." Abruptly, he pointed the light down at the corpse.

Langdon looked down and jumped back in shock.

His heart pounded as he took in the bizarre sight now glowing before him on the parquet floor. Scrawled in luminescent handwriting, the curator's final words glowed purple beside his corpse. As Langdon stared at the shimmering text, he felt the fog that had surrounded this entire night growing thicker.

Langdon read the message again and looked up at Fache. "What the hell does this mean!"