The scene
Papel Gallery · Display-case inspectionAn antique stamp vanished during a display-case inspection. Each restorer entered once to examine it and once more to leave a report; there were no additional visits.
The weight monitor places the disappearance during the fourth of the six visits. To identify the person, reconstruct the first round from the stated order relationships, then apply the second-round rule.
What we know for certain
One of these three people removed the stamp during their visit. The six visits did not overlap; the entire first round finished before the second began. Each person took part once per round. The records are reliable, and there were no accomplices.
The three accounts
Teo Prat
Paper restorer«My first visit was earlier than Vera's first visit.»
Vera Artés
Ink restorer«My first visit was after Teo's but before Zaira's.»
Zaira Soler
Stamp restorer«In the second round, we followed the reverse of the first round's order; that rule did not change.»
Examine the evidence
0 of 5 openedOpening these five clues does not cost points.
01The first relationship
The access log confirms that Teo completed his first visit before Vera began hers.
02The second relationship
Vera completed her first visit before Zaira began hers. Nobody is missing from the three-person round.
03The return rule
The second round followed exactly the reverse order of people from the first. The last person in the first round re-entered before the other two.
04The stamp's weight
The display case still registered the stamp's weight at the end of the third visit. By the end of the fourth, it no longer did. The sensor worked continuously, and no replacement weights were used.
05The six openings
The case was opened only during those six visits. Nobody remained inside between visits or could reach the stamp from outside.