"Tik-Tok of Oz" by L. Frank Baum is the eighth book in the Oz series. The story follows Betsy Bobbin, a young girl who, along with her loyal mule Hank, is shipwrecked and finds herself in the magical land of Oz. Joining forces with the mechanical man Tik-Tok, the Shaggy Man, and other fantastical characters, they embark on a quest to rescue the Shaggy Man's brother from the Nome King's captivity. Along the way, they encounter the Rose Kingdom and the rebellious Queen Ann Soforth. Through a series of adventures and with the help of new friends, they navigate the challenges of their journey and learn the power of friendship and perseverance.