The first in the bestselling Cogheart Adventures series, where mayhem, murder and mystery meet in a gripping Victorian world of fantastical imagination.Some secrets change the world in a heartbeat.Lily's life is in mortal peril. Her father is missing and now silver-eyed men stalk her through the shadows. What could they want from her?With her friends - Robert, the clockmaker's son, and Malkin, her mechanical fox - Lily is plunged into a murky and menacing world. Too soon Lily realizes that those she holds dear may be the very ones to break her heart...SHORTLISTED FOR THE WATERSTONES CHILDREN'S BOOK PRIZESHORTLISTED FOR THE BRANFORD BOASE AWARDSELECTED AS ONE OF THE NATION'S 100 FAVOURITE STORIES TO SHARE (World Book Day, 2018)"A steampunky tale of ambition, pursuit and revenge." The Guardian"A delightfully badly behaved heroine, enthralling mechanicals and a stormer of a plot." Abi Elphinstone"A glittering clockwork treasure." Piers Torday