books.google.com - When Karen shows off her roller-skating expertise and accidentally crashes into her brother, she ends up with a broken wrist but uses the opportunity to get everyone she knows to sign her new cast....https://books.google.com/books/about/Karen_s_Roller_Skates.html?id=h_-vfMZUtN8C&utm_source=gb-gplus-shareKaren's Roller Skates
Ann Mathews Martin was born on August 12, 1955 in Princeton, New Jersey. She received a degree in elementary education and psychology from Smith College. She worked as a teacher, was an editor of children's books for both Bantam and Scholastic, and then became a full-time writer. She is the author of several series including the Baby-sitters Club series, Baby-Sitters Little Sister series, California Diaries series, and Main Street series. Her other works include Ten Kids No Pets, Here Today, On Christmas Eve, and Rain Reign.