A hilarious fantasy adventure set in modern day London An exciting subterranean London adventure the first in a middle-grade trilogy Hyacinth Hayward has recently arrived from America & is having difficulty adjusting to her new surroundings especially being in the sole company of her eccentric mother Everything feels strange Very strange & it gets stranger the day she accidentally unleashes the power of a secret river running through London To prevent a second Great Fire Hyacinth needs to retrieve a single magically charged drop of water from somewhere in the city sewer system Along the way she encounters an eclectic cast of characters
- the shambling monstrous Saltpetre Men who kidnap her mother the Toshers who battle for control of magical artefacts & a giant pig with whom she has a tea party The clock is ticking
- will she figure out who to trust?