Lish, Mikki. House on Hoarder Hill (Series) #bk. 2

Return to the magic of Hoarder Hill in this spellbinding sequel! Exploring the mysterious tunnels under their grandfather's house on Hoarder Hill, Hedy and Spencer discover the Fantastikhana, an underground tournament of magic. Here they find a group of powerful magicians called the Sleight and a mysterious living map, which tattoos itself onto Hedy's skin and seems to be directing her further underground. And so an extraordinary treasure hunt begins

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