“Each Historical Mystery story is set either after or during the events of the Central Series, at some point after the character's meet book. For example, Shadows on Society Hill happens after Changes for Addy. The books are written by well-known authors from the History Mysteries series and the target audience is the nine-to-twelve age group. Each book has multiple layered mysteries occurring, with the title referencing the main mystery going on through the book.

The books had no inner illustrations and covered more mature topics than are touched on in the Central Series and include Looking Back sections that discuss the topics.

Early editions of books had removable bookmarks or information cards on the back flap that also listed other titles in the series, which were removed with the rebranding.

During BeForever, several prior mysteries were reprinted with new covers and additions including Addy’s.

All historical mystery books were retired with the end of BeForever in 2019. The series showcased all characters at least once but was heavily unbalanced towards character representation.” (American Girl Wiki, 2023)