When the royal family of Poshtonia visits Maywood, Olivia and Princess Stephanie are so surprised to discover how much they look alike that they cannot resist swapping places when the opportunity arises.

On pop-up pages. "Based on the screenplay written by Kent Redeker"--Page 4 of cover. "Based on the TV series Olivia as seen on Nickelodeon"--Page 4 of cover. Based on characters created by Ian Falconer.