"2019. Lucy awakens from a dream to find her hands around her ex-lover's throat. Horrified, she flees to her older sister's house, hoping she can help explain the strangley vivid nightmare that preceded the attack--but Jess is nowhere to be found. Desperate for answers, Lucy finds and begins to read her sister's adolescent diary. 1999. Jess is a lonely sixteen-year-old, until her young, charming art teacher takes an interest in her drawing. 1800. Twins Mary and Eliza fear the ocean, as their mother tragically drowned when they were just girls. Yet they begin to notice changes in their bodies that they can't explain and they feel the sea beginning to call to them."--from back cover.