A dazzling mystery from the bestselling author of the Mysterious Benedict Society, now a major TV series on Disney+! 'A timeless fantasy ... a stretching and satisfying read' THE GUARDIAN 'Full of great excitement and wonderful invention' THE NEW YORK TIMES 'This captivating page-turner, with layers of secrecy and intrigue, is a compelling read' BOOKTRUST When Reuben discovers an old pocket watch, he soon realizes it holds an incredible power: it can turn you invisible for fifteen minutes. He can't resist the lure of disappearance: for a time, he can vanish from the despotic regime of New Umbra. But the watch's power is even more extraordinary than he imagines. Soon, he's on the run from New Umbra's ruler, The Smoke, who's determined to possess it for himself ...

• A dazzling new story from Trenton Lee Stewart, author of the New York Times bestselling Mysterious Benedict Society series – now on Disney+
• Fantastical elements and a truly original setting form the backdrop for this twisty-turny mystery
• Includes quirky interiors illustrations