Meet the Blue Peter book awards Best Story winner
6 March 2014 Last updated at 09:33 GMT
Katherine Rundell is celebrating today after she was awarded the prize for Best Story in the Blue Peters book awards.
Rooftoppers is the magical story of a girl called Sophie, who everyone thinks is an orphan, but Sophie is determined to find her mother.
The book follows Sophie's journey as she follows clues that start with a cello.
Katherine joined Leah on the Newsround sofa to tell us how it feels to win the prize.