The "Betsy-Tacy Books" is a series of children's novels written by author Maud Hart Lovelace. The series follows the adventures of two young girls, Betsy Ray and Tacy Kelly, growing up in the early 1900s in the fictional town of Deep Valley, Minnesota. The books capture the joys and challenges of childhood, friendship, and family life. The series consists of several titles, starting with "Betsy-Tacy," published in 1940. The stories are beloved for their relatable characters and nostalgic portrayal of childhood. They have been praised for their ability to resonate with readers of all ages, making them a classic in children's literature.