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 on the coast --- 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 16-year-old in a rural town in the middle of the continent. She has always felt different, until her young, charming art teacher takes an interest in her drawings, seeing a power and maturity in them --- and in her --- that no one else has. 1800: Mary and Eliza have been torn from their loving father and forced onto a convict ship. For their entire lives, they’ve feared the ocean, as their mother tragically drowned. Yet as the boat bears them further and further from all they know, they begin to notice changes in their bodies that they can’t explain, and they feel the sea beginning to call to them.

2019: Under cover of darkness, Kate flees London for ramshackle Weyward Cottage, inherited from her great-aunt. The cottage is worlds away from the abusive partner who tormented Kate. But she begins to suspect that her great-aunt had a secret. 1619: Altha is awaiting trial for the murder of a local farmer. Her mother taught her their magic, which is rooted in a deep knowledge of the natural world. But as the evidence for witchcraft is set out against Altha, she knows it will take all of her powers to maintain her freedom. 1942: As World War II rages, Violet is trapped in her family's grand, crumbling estate. Her mother was rumored to have gone mad before her death. The only traces Violet has of her are a locket bearing the initial W and the word weyward scratched into the baseboard of her bedroom.