Books with title Kidnapped at Birth?

This chapter book series by Newbery Honor–winning and bestselling author Louis Sachar features one hilariously overactive imagination! Marvin Redpost has never felt like he fits in with his family. So when he hears a news report about a missing prince who looks just like him, he knows exactly what happened. Now all he has to do is tell Mr. and Mrs. Redpost that it’s time for him to move in with his real parents at the castle…. Hilarious and relatable, Marvin Redpost is perfect for kids who love to bond with quirky characters like Junie B. Jones and George Brown, Class Clown.

Illus. in black-and-white. Marvin Redpost has finally figured out why he doesn't look like anyone in his family. He's not really Marvin Redpost--he's Robert, the lost prince of Shampoon! "The story is wonderfully logical and absurd, with a wit and attention to detail rare in an easy reader."--Bulletin, Center for Children's Books. "Fast paced, easy to read, and full of humor."--School Library Journal.

Marvin lives in a grey house with a white fence - a white fence with all but one red post. He has red hair and blue eyes. He is also left-handed. "We're lucky to be left-handed," said Mrs. North. "It means we have royal blood." One day, at school, while writing a report, Marvin realises that nothing adds up. His parents have brown hair and they have brown eyes. Can he really be Marvin Redpost? Or is he, in fact, the lost son of the King of Shampoon - Prince Robert? Was he whisked away from the hospital at birth and are the Redposts really his kidnappers? Marvin sets out to get things straight. There are a lot of perks to being a prince and it's all very tempting but Marvin soon realises that sometimes the truth isn't all it's cracked up to be. Louis Sachar writes with pace and humour and heart. In this, the first in a series of eight books, he introduces strong and memorable characters in his unique and inimitable style.