Marisee and Robert - the Elemental Detectives - are back to solve another mystery on the streets of 18th 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.