The Galaxy of Fear Series by John Whitman (Published from 1997-1998):  

Timeline: 0-1 ABY (6-18 months ABY exactly) 
ABY= After the Battle of Yavin in Star Wars: Episode 4: A New Hope 

Total Number of Books in Series: 12 Books 
Average Page Length: ~150 Pages Per Book

Age Range: 8-12 Years Old is the Age Range Recommended Online. 

Grade Level: 3-7 Grade is Recommended Online 

Genre: Children’s, Teen and Young Adult Fantasy, Magic, and Adventure, Science Fiction, Spine-Chilling Horror 

Subjects: Family, Relationships, Mystery and Mystery Solving, Suspense, Space/Interstellar Travel, Facing Fears, Sibling Bonding, Courage, Survival, Racing Against Time, Friendship, Haunted Places, Zombies, Time Travel, and Virtual Reality 

Legends or Canon: Legends Middle Grade Chapter Book Series