The Royal Book of Oz by L. Frank Baum

Dorothy, who occupied one of the coziest apartments in Ozma's palace, wakened the morning after the party with a feeling of great uneasiness. At breakfast, the Scarecrow was missing. Although he, the Tin Woodman and Scraps did not require food, they always livened up the table with their conversation. Ordinarily Dorothy would have thought nothing of the Scarecrow's absence, but she could not forget his distressed expression when Professor Wogglebug had so rudely remarked on his family tree. The Professor himself had left before breakfast, and everybody but Dorothy had forgotten all about the Royal Book of Oz.

Already many of Ozma's guests who did not live in the palace were preparing to depart, but Dorothy could not get over her feeling of uneasiness. The Scarecrow was her very best friend, and it was not like him to go without saying goodbye. So she hunted through the gardens and in every room of the palace and questioned all the servants. Unfortunately, Jellia Jamb, who was the only one who had seen the Scarecrow go, was with her mistress. Ozma always breakfasted alone and spent the morning over state matters. Knowing how busy she was, Dorothy did not like to disturb her. Betsy Bobbin and Trot, real little girls like Dorothy, also lived in the Fairy palace, and Ozma was a great chum for them. But the Kingdom of Oz had to be governed in between times, and they all knew that unless Ozma had the mornings to herself, she could not play with them in the afternoons. So Dorothy searched by herself.