The most rebellious princess under the sea!


Dive into a magical new adventure with Emerald. From Harriet Muncaster, creator of the beloved Isadora Moon series, comes a sparkling new chapter book starring Emerald the mermaid. With charming two-colour illustrations and a funny, heartfelt story perfect for readers aged 5+, this enchanting series is ideal for fans of fantasy, friendship, and underwater adventures.

Emerald by Harriet Muncaster


Emerald and the Magic Shell

From the creator of Isadora Moon, Harriet Muncaster-featuring Isadora's mermaid friend, Emerald!

Explores the dynamics of a blended family in a gentle and relatable way.

Perfect for readers who are looking for a mermaid story with a splash of wildness and wonder.

A charming and funny series of first chapter books beautifully illustrated in two-colour.

Animated series coming to Sky Kids TV in 2025!

Author and illustrator Harriet Muncaster

Harriet Muncaster is one of the fastest-rising stars in children's books. She started out writing and illustrating picture books, and won the Blue Hen Book Award for her first book, I Am a Witch's Cat, and was highly commended for the Macmillan Prize while studying for her second illustration degree. Her move into young illustrated fiction came with the launch of Isadora Moon in 2016 and the series has become a huge bestseller in the UK and internationally. Harriet is very active at events, festivals, and on social media, constantly creating and sharing new content and activities to delight Isadora's growing host of fans.

Emerald and the Runaway Royal

From the creator of Isadora Moon, featuring Isadora's mermaid friend, Emerald!

Perfect for readers who are looking for a mermaid story with a splash of wildness and wonder.

A charming and funny series of first chapter books beautifully illustrated in two-colour.

Explores themes of how to deal with other people's expectations, and feeling comfortable in your own skin.

Author and Illustrator Harriet Muncaster

Harriet Muncaster is one of the fastest-rising stars in children's books. She started out writing and illustrating picture books, and won the Blue Hen Book Award for her first book, I Am a Witch's Cat, and was highly commended for the Macmillan Prize while studying for her second illustration degree. Her move into young illustrated fiction came with the launch of Isadora Moon in 2016 and the series has become a huge bestseller in the UK and internationally. Harriet is very active at events, festivals, and on social media, constantly creating and sharing new content and activities to delight Isadora's growing host of fans.

Emerald and the Lost Treasure

From the creator of Isadora Moon, featuring Isadora's mermaid friend, Emerald!

Isadora Moon, Emerald, and Mirabelle appear in a story together for the first time ever!

Perfect for readers who are looking for a mermaid story with a splash of wildness and wonder.

A charming and funny series of first chapter books beautifully illustrated in two-colour.

Explores themes of the importance of looking after our planet and the challenges of trying to act unselfishly.

Author and Illustrator Harriet Muncaster

Harriet Muncaster is one of the fastest-rising stars in children's books. She started out writing and illustrating picture books, and won the Blue Hen Book Award for her first book, I Am a Witch's Cat, and was highly commended for the Macmillan Prize while studying for her second illustration degree. Her move into young illustrated fiction came with the launch of Isadora Moon in 2016 and the series has become a huge bestseller in the UK and internationally. Harriet is very active at events, festivals, and on social media, constantly creating and sharing new content and activities to delight Isadora's growing host of fans.

Emerald and the Ocean Parade

From the creator of Isadora Moon, a brand-new series featuring Isadora's mermaid friend Emerald!

Perfect for readers who are looking for a mermaid story with a splash of wildness and wonder.

Beautifully illustrated in two colour, a charming and funny series of first chapter books.

Isadora Moon has sold nearly 4 million copies worldwide.

Author and Illustrator Harriet Muncaster

Harriet Muncaster is one of the fastest-rising stars in children's books. She started out writing and illustrating picture books, and won the Blue Hen Book Award for her first book, I Am a Witch's Cat, and was highly commended for the Macmillan Prize while studying for her second illustration degree. Her move into young illustrated fiction came with the launch of Isadora Moon in 2016 and the series has become a huge bestseller in the UK and internationally. Harriet is very active at events, festivals, and on social media, constantly creating and sharing new content and activities to delight Isadora's growing host of fans.

Emerald and the Sea Sprites

From the creator of Isadora Moon and Mirabelle.

A charming and funny series of first chapter books beautifully illustrated in two colour.

Perfect for readers who are looking for a mermaid story with a splash of wildness and wonder.

Isadora Moon has sold 4 million copies worldwide.

Author and Illustrator Harriet Muncaster

Harriet Muncaster is one of the fastest-rising stars in children's books. She started out writing and illustrating picture books, and won the Blue Hen Book Award for her first book, I Am a Witch's Cat, and was highly commended for the Macmillan Prize while studying for her second illustration degree. Her move into young illustrated fiction came with the launch of Isadora Moon in 2016 and the series has become a huge bestseller in the UK and internationally. Harriet is very active at events, festivals, and on social media, constantly creating and sharing new content and activities to delight Isadora's growing host of fans.

Emerald and the Ocean Parade

From the creator of Isadora Moon, a brand-new series featuring Isadora's mermaid friend, Emerald!

Beautifully illustrated in two colour, a charming and funny series of first chapter books.

Perfect for readers who are looking for a mermaid story with a splash of wildness and wonder.

Isadora Moon has sold nearly 4 million copies worldwide.

Author and illustrator Harriet Muncaster

Harriet Muncaster is one of the fastest-rising stars in children's books. She started out writing and illustrating picture books, and won the Blue Hen Book Award for her first book, I Am a Witch's Cat, and was highly commended for the Macmillan Prize while studying for her second illustration degree. Her move into young illustrated fiction came with the launch of Isadora Moon in 2016 and the series has become a huge bestseller in the UK and internationally. Harriet is very active at events, festivals, and on social media, constantly creating and sharing new content and activities to delight Isadora's growing host of fans.