Catherine Doyle & Katherine Webber are both bestselling and award-winning writers of YA and children's books. In addition to cowriting Twin Crowns, they are soon to be sisters-in-law.

Katherine is from Southern California and spent much of her childhood in the Palm Springs desert. She is the author of Only Love Can Break Your Heart and The Revelry. For younger readers, she also cowrites the Sam Wu Is Not Afraid and Dragon Realm series with her husband, Kevin Tsang. She is currently based in London with her husband and young daughters.