The Door in the Moon — Catherine Fisher

Only the Obsidian Mirror can save a life, change the past, or rescue the future.

In this third volume of the internationally acclaimed Obsidian Mirror series, it's Midsummer Night. It's hot. And everyone in Wintercombe Alley is dreaming strange and disturbing dreams -- until Jake and Sarah are swept through the Obsidian Mirror and time itself into a nightmare world of revolution and murder. Meanwhile, Oberon Venn faces a choice between staying mortal or losing his soul in the tangled green wildwood of the faerie realm. Catherine Fisher, master of world-building and plot twists -- from a masked ball to a desperate struggle at the very foot of the guillotine -- continues the breathtaking and dangerous search for those who Time has snatched away.