Julia has the unusual ability to be...unseen. Not invisible exactly. Just beyond most people's senses. It's a dangerous trait in a city that has banned all forms of magic and drowns witches in public Cleansings. But it's a useful trait for a thief and a spy. And Julia has learned - crime pays. She's being paid very well indeed to infiltrate the grand house of Mrs. Och and report back on the odd characters who live there and the suspicious dealings that take place behind locked doors.