USA TODAY BESTSELLER

When an apprentice through the Mapmakers’ Guild goes missing, Matt and India are used to find him. Going undercover being a married couple, they find that not really everyone on the guild is exactly what they appear, and the lad’s unearthly maps triggered jealousy, suspicion and dread.

With among the apprentice’s magic maps in their possession, India and Matt need to use their wits and India’s fledgling, untried magic to look for him. However the even more they investigate, the greater sinister plots they uncover, including a link between the Mapmakers’ and Watchmakers’ Guilds, and an ancient marvelous treasure buried under the streets of London.

As the net of suspicion widens and opponents draw closer, it isn’t simply the apprentice’s life that’s in peril, but Matt’s too. Someone will go to great measures to prevent him finding the name of the person who can fix the watch keeping him alive. Great measures indeed.