'Electrifying and magical... you know you’re in the hands of a master storyteller' A. F. Steadman, author of Skandar

A rip-roaring adventure story of magic, myth and mermaids, featuring Liz Kessler's popular character Emily Windsnap.

Neptune and Thor battle for power and their fight upsets the balance of the world. Lightning strikes, curses fly and towering waves swallow a Viking longship and its crew into a watery valley, taking with it the secret of the magical blue crystals.

A thousand years later, Emily, a girl who is half human, half mermaid, discovers a bangle with a mysterious and beautiful blue crystal. With the help of her human and mer friends, she discovers the truth about the jewel – and the danger the world faces. The team must race against time to persuade the powerful but notoriously selfish gods of sea and sky to make peace with each other, before disaster strikes.

'An electrifying return to Emily Windsnap’s world of mermaids. Magical and immersive with beautifully explored themes of friendship and power – you know you’re in the hands of a master storyteller.' -- A. F. Steadman, author of Skandar and the Unicorn Thief
'Packed with mythology, magic, and high-stakes adventure... highly recommended' * School Reading List, Best Children's Books 2025 *
An exciting new, standalone adventure... written with warmth and sensitivity, and exploring themes of friendship, power and conservation, this is a treat for Emily Windsnap fans new and old.' * Lancashire Post *

Liz Kessler has written over twenty books for children and young adults, including the internationally best-selling series about half-mermaid Emily Windsnap. She has an MA in Novel Writing from Manchester Metropolitan University and has been a full-time author for the last twenty years. Her book When the World Was Ours won the 'Choice of the Youth Jury' Deutscher Jugendliteraturpreis award. Liz lives with her wife and their dog in Cheshire.