If it is supposed to be about 123+ pages, may I suggest something easy like The Nightmare Room-Thrillogy 2 by R.L. Stine.
Twelve ultra-smart, ultra-competitive kids have been selected to take part in a survival competition called Life Games.
Not only will they have to overcome the dangers of life on a tropical island, they'll also have to face the evil presence thatlives there ... waiting for its next victim.
What Scares You the Most?
April is stranded on the island! She's desperate to escape and get back to her normal life. But April's life will never be normal again. Because someone -- or something -- evil will follow her home, using her deepest fears against her.
Its really good for pretty slow readers, but I'm a fast reader so I read it in less than 2 hours
Its really like a mystery, but its a little scary. Give it a try!
If you are looking for a book, then I will sugest The Outsiders. It is the best book in the world (in my opinion that is) and is a great example of a memoir!