Katherine Rundell
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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.