The American Girl Books Kirsten Set includes two paperback books, numbers 2 and 6 in the series. Written by Janet Shaw, these fictional narratives are published by Scholastic and are geared towards children and young adults aged 9-12. The books, "Kirsten Learns a Lesson" and "Changes for Kirsten," are set in the United States during the mid-1850s and are written in English, making them a captivating addition to any young reader's collection.