"Monday Charles is missing, and only Claudia seems to notice. Claudia and Monday have always been inseparable -- more sisters than friends. So when Monday doesn't turn up for the first day of school, Claudia starts to worry. When she doesn't show for the second day, or the second week, Claudia knows that something is wrong. Monday wouldn't just leave her to endure tests and bullies alone. With her grades on the line, Claudia needs her best -- and only -- friend now more than ever. But Monday's mother refuses to give Claudia a straight answer, and Monday's sister April is even less help. As Claudia digs deeper into her friend's disappearance, she discovers that no one seems to remember the last time they saw Monday. How can a teenage girl just vanish without anyone noticing that she's gone?"--

Monday Charles is missing, and only Claudia seems to notice. Claudia and Monday have always been inseparable, more sisters than friends. So when Monday doesn't turn up for the first day of school, Claudia's worried. As Claudia digs deeper into her friend's disappearance, she discovers that no one seems to remember the last time they saw Monday. How can a teenage girl just vanish without anyone noticing that she's gone?

Monday Charles is missing, and Claudia seems to be the one person who notices. They've always been inseparable, and when Monday doesn't show up for school for two weeks, Claudia knows that something is wrong. Monday's mother refuses to give Claudia a straight answer, and her sister April is even less help. How can a teenage girl just vanish without anyone noticing that she's gone?