There are Honour Crimes Among Thieves
The Jewel Thief was not always this way.
Once upon a time he was a happy and honourable child, but that all changed when he lost his family. He was sent away to an orphanage where he had to fend for himself. Not long after, a rich family bought up the land the orphanage was on, sold it and kicked the children out; so he had to fend for himself even more.
Now the Jewel Thief is at the bank, hoping to infiltrate the rich family’s vault Gringotts-style, and steal back, if not his childhood, a lot of jewels.