Monday It appears that only Claudia is aware that Charles is missing. More like sisters than pals, Claudia and Monday have always been inseparable. Claudia is concerned when Monday doesn't show up for the first day of school. Claudia recognises a problem when she doesn't show up for the second day or the second week. She wouldn't be left alone on Monday to deal with tests and bullies. Not with her grades on the line and the rumours from last year. More than ever, Claudia needs her best friend?and only friend. Monday's sister April is even less helpful, and Monday's mother won't give Claudia a straight answer. Claudia learns that no one can recall when they last saw Monday as she continues to investigate the disappearance of her friend. How can a teenage girl just vanish without anyone noticing that she?s gone?