A stunningly imagined, action-packed fantasy adventure for fans of Nevermoor, Neverwhere and Mortal Engines, from bestselling and award-winning author Patrice Lawrence.

"A beautifully written book, bristling with magic, set in an ancient London filled with dragons, ghosts, water spirits, and a mysterious, creeping sleeping-sickness that must be fought by the brave young heroes. I loved it." Cressida Cowell, Children’s Laureate & author of How to Train Your Dragon.

Step into a London lit up by the Elemental spirits: the fiery Dragons, the airy Fumis, the watery Chads and the earthbound Magogs.

Marisee and Robert - the Elemental Detectives - are back to solve another mystery on the streets of eighteenth century London. An orchestra explodes in Vauxhall Pleasure Gardens and suddenly the music of London disappears... and a terrifying monster stirs off the Greenwich peninsular, threatening to trample London underfoot.

The detectives must track down the thief behind the music's disappearance - via the Whispering Gallery of St Paul's Cathedral, a Windmill-with-teeth on the Isle of Dogs and the dark streets of Soho... where a shadowy villain and his mechanical animal spies live.