[Vote] Gone the Aurora Opal - Detective Game

The truth sees through glass.

📕Story Background

At the Antarctic Research Station's annual gala, inside a heated geodesic dome, a rare "Aurora Opal" is on display for a charity auction. The opal sits inside a small glass display case filled with dry ice fog, creating a dreamlike visual effect. At exactly 8:00 PM, the lights flicker once. When they steady, the opal is gone. The glass case remains intact, dry ice fog still billowing from its top vent.

You, the station's head of security, seal the dome's exits and question the four guests who were closest to the display table:

Dr. Frost (Glaciologist): Dr. Frost squints at his thermal imager, his lips slightly purple. "I was measuring the temperature of the dry ice using this thermal camera," he says coolly. "At 7:59 PM, the opal was still there. At 8:01, it was gone. The fog was too thick to see anyone reach inside, but the opal's thermal signature was very clear. It should be the coldest object in the case."

Kai (Logistics Coordinator): Kai wears thick insulated gloves, dry ice residue on his fingertips. "I was behind the display table refilling dry ice from a Dewar flask," he says. "My back was turned for maybe 30 seconds. I heard a soft 'click,' but when I turned around, the opal was gone. The glass case looked undamaged. I wore these gloves to protect against frostbite."

Colonel Rivas (Head of Security): Colonel Rivas holds a pair of sunglasses. "I was watching the crowd through the reflection on the polished metal support pillar of the dome," he says. "That pillar acts like a mirror. I saw a gloved hand reach into the case from the left, but the fog hid the face. The hand had a red cuff."

Poppy (Event Host): Poppy holds a small handheld fan. "I was right next to the case, using this fan to make the dry ice fog swirl artistically," she says. "I accidentally blew the fog toward the left, and for a moment the view cleared. That's when I saw the opal was already gone. I must have missed the actual theft because the fog blocked my view."

🔍Known Clues

1.Dry ice (solid CO₂) is colder than -78°C and is heavier than air. It sinks to the ground and the bottom of the display case. The fog constantly billows and escapes through a small vent at the top of the case.

2.The glass display case is otherwise sealed except for the top vent. The opal rests on a small brass stand inside.

3.Thermal cameras cannot see through glass. Ordinary glass is opaque to long-wave infrared radiation (heat). A thermal imager only detects the temperature of the glass surface, not objects behind it.

4.Dome temperature is a comfortable 20°C. Dry ice exposed to warm air sublimates rapidly, producing thick fog. Unless actively blown away, the fog obscures visibility from all angles.

5.The metal support pillar is made of brushed stainless steel with a matte finish. It produces only blurred, distorted reflections, not clear mirror-like images.

6.Kai's gloves are inspected. They show slight moisture on the inside but no frostbite damage from direct dry ice contact. The dry ice remaining in his Dewar flask does not match the amount he claimed to have used — significantly less.

7.Poppy's fan is a small battery-powered handheld model. Tests show it cannot effectively blow away dry ice fog inside the display case; it only creates weak air currents at the top vent.

8.Dr. Frost's thermal imager is a consumer-grade model. Its manual clearly states: "This device cannot image through glass, water, or solid surfaces." A copy of the manual is found in his pocket.

🕵️‍Questions and Discussions for YOU

1.Who stole the Aurora Opal? Explain the scientific flaw in their alibi and your reasoning.

2.Have you ever visited a science museum, polar exhibition, or similar event? Share an interesting experience. (Open-ended)

🎉Participation Rewards

The FIRST user to successfully deduce the identity of the "culprit" and their motive in the comment, will receive a reward of 2,000 GT points! Other participants will earn 200-500 GT points based on the completeness of their submissions. 💰(Except for extended special edition)

📅Submission Deadline

May 15, 2026

Reminder: This is the submission deadline if you want to claim the reward with your vote, but after this date the vote will still remain open for a period of time, so please feel free to participate at any time if you want to test your skills, detectives!

----- Previous answer (The Locked Study) -------

Answer: Clara Bennett (Editor) took the manuscript and caused Eleanor’s collapse. She did not intend serious harm; her goal was to stop the manuscript from being published as-is.

Reason:

1. Time anchor—7:45 PM: Eleanor’s watch stopped at 7:45 PM, unlikely without impact or tampering. Clara was in the study 7:35–7:45 PM and quarreling with Eleanor, matching the moment something abrupt happened.
2. “Silver feather” points to Clara: The note was written in Eleanor’s hand but shows pencil scuffs, suggesting haste and an unusual writing tool. “Silver feather” aligns with the feather-shaped metal fragment found on the carpet—consistent with Clara carrying a silver feather bookmark kept in her folder, a gift from Eleanor years ago.
3. Window + green paint: The open window, sill scratches, and green paint indicate someone used the window. Clara’s cuffs had green paint (from her recently renovated, green-painted studio). Leaving via the window also avoids clearer footage from the main exit; the scratch marks fit someone climbing while holding a folder.
4. Bitter almond scent is misdirection: The almond odor came from Clara’s almond-flavored baking essence (the “food grade” jar). It spilled near the teacup during the argument, creating a “poison-like” atmosphere without actual toxins. Eleanor fainted from emotional shock and low blood sugar, not poisoning.
5. Motive in the notebook: “Confidential—if leaked, years of work are ruined” implies the manuscript contained information that could expose Clara’s past academic misconduct. Eleanor insisted on publishing; Clara took the manuscript to remove the damaging section, not to keep it forever. “Overdue for three months” and the paintbrush doodle are deliberate distractions pointing toward Lena and Hale.
6. Locked door explained: Clara didn’t need force or a spare key—Eleanor allowed her in. After the quarrel, Clara exited via the window. Eleanor locked the door from the inside afterward and collapsed soon after; the key remained in her pocket.
7. Eliminating others: Hale has witnesses and no residue; Marcus’s time and failed entry don’t align with the critical moment, and he lacks paint/odor traces; Lena’s movements are supported by traffic footage and she had no access to the core manuscript or green paint.

We will be rewarding 200 GT points to all players who voted correctly, and additional points to some outstanding responses.

Congratulations and enjoy your juicy GT points reward!!!