Spell Sisters: Grace the Sea Sister: Volume 5
Amber Castle, Mary Hall
When eleven-year-old Gwen ventures into the forest beyond her castle home she comes across the magical island of Avalon and her life changes forever. The lady of the lake, Nineve, asks Gwen to embark on a quest to protect the enchanted island of Avalon from the evil sorceress Morgana Le Fay.
Morgana has imprisoned the eight Spell Sisters of Avalon throughout the kingdom and stolen their magical powers. It’s up to Gwen, her best friend Flora and a very special horse named Moonlight to find the sisters and return them to Avalon before its magic is lost forever.
In their fifth adventure Gwen and Flora face stormy seas and dangerous cliff-climbs to save Grace the Sea Sister from Morgana’s spell.
Reviews

This book was full of adventure and mystery, and magic of course.
Senorita Honeycomb Tinkle 11.08.2020

In this 5th book of the spell sister series where Gwen and Flora have another exciting adventure to try and rescue Grace, the spell sister who has power over the seas. Gwen got to visit her family and I liked her little sister who wanted to be just like Gwen. I did not know that children had to stay away from their parents in the old days.
Anonymous 03.07.2016

Well I would give this book to girls because it adventurous and quite suitable for girls.
Anonymous 09.08.2015