Jack and Gwen are back in this dynamic follow-up to The Lost Property Office.

The chase to recover some of the Crown Jewels, specifically the infamous cursed ruby named for Edward the Black Prince, son of King Edward III, leads Jack and Gwen deep into the strange world of tunnels, cathedrals, and river systems beneath London to find the Thieves Guild, then back along the jewel’s journey through the royal houses of Europe to its origin at a forgotten mine in India.