Books range from 650L-850L. The Boxcar Children by Gertrude Chandler Warner. The series is written for elementary school readers who like adventures and mystery stories. Books range from 400L-700L. Encyclopedia Brown Series by Donald J Sobol. This series is written for readers in elementary schools. A boy detective solves mysteries using his wits.
Mysteries range from stolen bikes to kidnapping.
Books range from 560L-880L. The Hardy Boys by Franklin W Dixon . This series is written for readers in elementary and middle school. Boy detectives who solve mysteries around the world from counterfeit gangs to haunted houses. Books range from 400L-860L. Hercule Poirot Mysteries by Agatha Christie. This series is written for readers in middle school and high school.