Sylvia Bishop

Transplanted from her exciting life as an explorer's daughter, Freya finds herself miserable at boarding school. She hates the boring rules, the other girls are mean and the headmistress is frostiness personified. When a bat removal expert is called in to deal with an infestation, Freya meets his irrepressible children - and makes friends at last. Together they explore the city, with particular interest in the grand exhibition showing priceless artefacts for the first time. Then the objects are stolen in a dramatic heist, and Freya is sure her new friends are responsible - but the true culprit might be closer to home....

Kelda has always protected her little sister Isla from danger on the rivers, and from the suspicions of their community. For Isla cannot breathe underwater - and so her very existence is forbidden by silvermen's Lore. Now the rivers of England are growing sick: monstrous creatures are awakening and a fierce torrent of blame falls upon Kelda's family.

When betrayal comes, the sisters escape on a desperate journey upstream. Joining forces with a mysterious boy, Kelda discovers the darkest depths of her kind's secret history. But to save both her sister and the very life of Britain's waterways, Kelda will have to make a sacrifice - one that will change her life forever.