Book Two - Wendie Willson - Bog

Nine-year-old Aly Rutherford's an unwilling member of the Seven, an ancient group of warriors dedicated to protecting the world from evil.
Aly's mother remains trapped in a mysterious marble disc. To make matters worse, her guide Madge, a talking white raven, is now imprisoned in a similar disc, and Hoarse, Aly's other guide and Madge's mate, blames Aly for his other half's disappearance. And just to add the cherry to the top of this disaster sundae, Aly's personal nemesis, Dave, is a member of the Seven.
Dave wants to help Aly, her grandmother, and her two best friends in their quest to release Madge and Aly's mom, but Aly's not sure she wants to accept his help. After all, he's Dave.
When Aly loses the two discs, however, she'll need all the help she can get, including that of Arius, a friendly dolphin. But Arius needs Aly's help in return-the ocean is warming, threatening his home.
Tough, smart, and independent, Aly's not a girl to give up easily. If anyone can retrieve the discs and save Arius's home, it's Aletrice Nike Rutherford. Just don't call her Aletrice-she hates that name.