The series plan spans six reading levels, with 240 stable story numbers. The First Feather begins the Grade 1 journey; later volumes build toward longer, more complex adventures.
Science, history, geography, civics, and economics are part of the planned world of learning. The volume overview shows the broad route without giving away the larger mystery.
Reading levels describe the intended reading experience. They do not set a child's pace, and a character's age is not the same thing as a reader's grade. Release information will be announced when available.