Abby Diamond is an eleven year old girl who loves to solve the mysteries that surround her and her three best friends: Neils, Andrea and Alison.
Being blind does not stop this girl detective from solving the mysterious cases that happen in her home and at school.

Abby is smart, self reliant and ready to take on any problems that come her way along with her friends aka The Four Musketeers.

Neils- An adorable redhead who is Abby's best friend and a tomboy by heart. If anyone loves a mystery better than Abby it is Neils.

Andrea- A tall striking dark-skinned young girl who has both beauty and brains. Andrea is the leader of The Four Musketeers who never fails to have a successful ending.

Alison- A quiet innocent girl who is the daughter of a famous movie star, Kaitlyn Summers. Although Alison has experienced the lifestyle of the rich and famous, she much prefers to live with her adopted dad, Audie who manages the school cafeteria.

Jaxson- A chubby outcast with poor grammar but who becomes lovable and a dear friend to Abby and her friends.

Glen- Jaxson's sidekick. Glen does not have a mind of his own, so he depends on Jaxson to be his voice. He is also known as "the parrot."

Join Abby, Neils, Andrea, Alison, Jaxson and Glen when the group attends middle school and meets up with bullies and a teenage wizard.

Children will learn about the mysteries of the Titanic and World War Two when Abby and her friends find a diary written in Braille.

Who does the diary belong to and what secrets do the girls vow to keep for the rest of their lives?