Books are written in first person, in the style of a "choose your own adventure book." The unnamed protagonist in the book is female and mostly not described so as to leave the image vague. Generally, she has at least one personal problem and/or skill in her life that relates in some way to the Historical character's life--for example, the character in Julie's Journey book is dealing with adjusting to her parents living in separate locations and the worry they might divorce, is unsure of making new friends at a new school, and is also good at basketball like Julie.