Rocket Readers FIVE ALIVE Christian Heroes by Peggy Wilber & Marianne Hering. Includes 5 books-Level 2-Paper back. This set of 5 Rocket Readers are great for your early reader. They give a brief glimpse into the lives of five Christian Heroes -Gladys Aylward, David Livingstone, Samuel Morris, George Mueller and Corrie ten Boom. Age Level 4-5 year old.