Mrs. Hargreaves asked Gavin to leave the room. He gathered his laptop with shaking hands and walked out without a word, and nobody watched him go. Mr. Adeyemi then asked me to sit at the head of the table. He asked how I had solved the glue problem, and I explained it for forty minutes, drawing on the whiteboard, while six people from Oakfield took notes. It was the best meeting I had ever had in that building.

That afternoon, Mrs. Hargreaves asked me to bring my original files. I had saved everything: dated photographs of each prototype, my spare bedroom workbench, and the emails I had sent to Gavin in March. The company’s lawyers confirmed the design was mine, and an internal review found that Gavin had presented two other employees’ ideas as his own the year before. He was asked to resign by Friday. I felt no joy, only a quiet, tired relief that the truth had finally been written down.

Oakfield signed a five year contract for the carton, and Mrs. Hargreaves created a new role for me, Head of Packaging Innovation, with my own team and my own name on the door. I asked for one condition. Every design our company produced would carry the name of the person who drew it. Within a month, every carton, label, and crate that left the building had a tiny printed initial in the corner, and the engineers started to stand a little straighter.

Mr. Adeyemi still sends me a note every Christmas. Last year it said, “Your tab holds.” I keep the first prototype on my desk, the one built from board and a craft knife in my spare bedroom, and when young engineers visit, I show them the little eleven degree fold. I tell them one thing. Keep your sketches, date your work, and never hand your best idea to someone who only says, “Leave it with me.”