Water by Robin McKinley; Peter Dickinson

Haunting, captivating, and beautifully rendered, Water explores the magical creatures that inhabit the sea. Some are as almost-familiar as mermaids; others are as strange as the thing glimpsed only as a golden eye in a pool at the edge of Damar's Great Desert Kalarsham. And then there is the unknowable, immense Kraken who lives beyond the darkness of the deepest ocean--a shadowy being who one day will rise and rule the world...