Jake's father disappears while working on mysterious experiments with the obsessive, reclusive Oberon Venn. Jake is convinced Venn has murdered him. But the truth he finds at the snow-bound Wintercombe Abbey is far stranger ... The experiments concerned a black mirror, which is a portal to both the past and the future. Venn is not alone in wanting to use its powers. Strangers begin gathering in and around Venn's estate: Sarah - a runaway, who appears out of nowhere and is clearly not what she says, Maskelyne - who claims the mirror was stolen from him in some past century. There are others, a product of the mirror's power to twist time. And a tribe of elemental beings surround this isolated estate, fey, cold, untrustworthy, and filled with hate for humans. But of them all, Jake is hell-bent on using the mirror to get to the truth. Whatever the cost, he must learn what really happened to his father.

Part Dr. Who, part Blade Runner, and part A Midsummer Night’s Dream, this genre-busting fantasy from the author of Incarceron asks: If you had the chance to change the past, would you do it? In book two of the critically acclaimed Obsidian Mirror series, New York Times bestselling author Catherine Fisher, called “the first lady of British fantasy” by the London Times, once again shows us that she is a master of world-building and surprising plot-twists. Jake, Sarah, and Oberon Venn continue their fight for control of the Obsidian Mirror, and whoever wins will either save a life, change the past, or rescue the future. But the Mirror has plans of its own.

This New York Times bestselling author once again shows us that she is a master of world-building and surprising plot-twists. The vast, intricate world, fascinating revelations, and unexpected turns in the final book of the Obsidian Mirror trilogy will appeal to readers of Cassandra Claire, and will satisfy existing fans fully.

A great storm brews out at sea and batters the Devon coast, flooding vast swathes of land. At Wintercombe Abbey the preceding weeks have been spent in a ferment of experimentation, as Jake Wilde's father, David and Maskelyne work furiously on Operation Leah. They have been practising changing tiny events in the past, in preparation for the rescue of Venn's wife Leah from death, the culmination of their work with the Obsidian Mirror. But in the aftermath of the storm, the Abbey is a drowned house. Where is the Mirror? What has happened to the two halves of the Janus coin? Whose is the mysterious boat wrecked up on the nearby beach? And what plans of mischief and mayhem lay in store for Halloween - the day chosen for Leah's return? Riddles and mysteries unfold in the spellbinding conclusion to The Obsidian Mirror quartet.