After school, Beezus is anxious to share with her mother what she learned about Christopher Columbus. However, Mrs. Quimby needs Beezus to watch Ramona so she can take a trip to the market. Mrs. Quimby allows Ramona to eat two marshmallows after her nap, but Beezus finds her sister using them to powder her face. When Ramona asks, “What’s Christopher Colummus?” (95), Beezus decides to teach her sister that the world is round, not flat. She explains that people can walk in a straight line and return to the exact spot at which they began. Ramona is uninterested and continues “powdering” her face. After a change of clothes and a snack, Beezus decides to read to Ramona to keep her out of trouble, but when she calls for Ramona, there is no answer. Beezus checks every room and closet, including the attic and the spooky basement, but there is no sign of her sister. Beezus begins to think Ramona’s disappearance is her fault, wondering if she tried to walk a circle around the globe after Beezus’s lesson on Christopher Columbus. Beezus recalls another time when Ramona went missing when she tried to find the pot of gold at the end of a rainbow.