“...Have you never seen someone with a knot tattoo all the way around their arm, or wrist, or ankle?”
Jack thought back to the sailors he used to see on the docks. “Well, now you mention it, I suppose I have, yes.”
“Well then. Those are to stop beasties like your one from moving freely all over the body. Usually, but not always, you see them on the kind of rogues who may have untied a knot they were not supposed to be untying. Or possibly people who have taken the precaution in anticipation of such a problem.”
“Oh,” said Jack. “I thought they were just patterns.”
The man smiled, not unkindly, and extended his hand. “Everything is just patterns, my dear boy.”
—Liffley Washcord, Inspector of Knots, meets Jack
who worked in a pie-shop
until his sister was abducted by pirates