Challenge of Spring

The year-round theft! The criminal bold enough to flout the laws ought to exhibit daring in his targets as well, but few did. At last a heroic burglar declared his intention to steal the entire year and acted accordingly. The Jewel of Summer, the Jewel of Winter, and the Jewel of Autumn were in his little pocket.
"Oh, it's terrible!" What else could the gallery owner say? The Jewel of Spring was his responsibility but not his to sell, which he would have done just to sleep again. The police were sweating too. They had failed three times.
Around the gate they were posted, around the rear entrance, the side entrance, the balcony, and the equivalent entrances of every adjacent building. Disguised inspectors walked up and down the street as if pondering a purchase while custodes mingled with the visitors.
"But it's up here that it's best to wait, Falgunus!" Inspector Iagius told his custos.
"What makes you say so, sir?"
"The oath I took when I became an inspector to use my wits instead of sticking to rote procedure and claiming it's the fault of the regulations when I fail, Falgunus." What a striking figure he was on the roof across the street, watching over the gallery like a sympathetic god!
Suddenly, the alarm. Policemen scrambled all over the ground level, the second level, and the third and fourth, but the thief was ahead of them. He jumped up the first flight of stairs, leapt up the second, and so on, until he hopped up to the gallery roof and then crossed the street with a single superhuman bound. Right into the waiting arms of Custos Falgunus! The malefactor's panicked struggles availed nothing against the brawny limbs of the law.
"You see, Falgunus? The wizard-crafter made this seasonal jewel to absorb the very power of spring. The lesson is to look into the qualities of what you're guarding and not just the price."
Another triumph for Inspector Iagius!
Finis