The clerk’s face wrinkled suddenly in avarice and fear. His hand hovered over the box, darting back and forth inconclusively. He got up and stalked over to his room’s entrance. He listened. There was no sound from the burnished corridor.

The clerk returned to his desk, calculating risk and benefit frantically. He looked closely at the invoice. It was stamped with an illegible crest, but the actual information was handwritten. He fumbled in his desk drawer without giving himself time to think, his eyes darting constantly back to the deserted passage outside his doorway, and brought out a paper-knife and a quill. He scratched with the sharp knife at the straight line on the top and the end of the curl on the bottom of the 5 on the invoice, gently, gently, shaving them away. He blew away paper- and ink-dust, smoothed the roughened paper carefully with the feathered end of his quill. Then he turned it around and dipped the fine point in his inkwell. Meticulously, he straightened the curling base of the digit, converting it into crossing lines.

Eventually, it was done. He straightened up and squinted critically down at his handiwork. It looked like a 4.

That’s the hard bit, he thought.

He felt about him for some container, turned his pockets inside out, scratched his head and thought. His face lit, and he pulled out his glasses case. He opened it and filled it with shredded paper. Then, his face wrinkling with anxious disgust, he pulled the edge of his sleeve down over his hand and reached into the box. He felt the soft edges of one of the big caterpillars between his fingers. As gently and quickly as he could, he plucked it squirming from its fellows and dropped it into his glasses case. Quickly, he closed the case around the frantically twitching little creature and fastened it.

He buried his glasses case at the bottom of his briefcase, behind mint-sweets and papers and pens and notebooks.

The clerk retied the string on the box, then sat back quickly and waited. His heart was very loud, he realized. He was sweating a little. He breathed deeply and squeezed his eyes closed.

Relax, now, he thought soothingly to himself. That’s your bit of excitement over.

Two or three minutes passed, and no one came. The clerk was still alone. His bizarre embezzlement had gone unnoticed. He breathed easier.

Eventually he looked again at his forged invoice. It was, he realized, very good. He opened the ledger and entered, in the section marked R&D, the date and the information: 27th Chet, Anno Urbis 1779: From merchant ship X. SM caterpillars: 4.

The last number seemed to glare at him as if it was written in red.