Silence is Goldfish
Silence is Goldfish is the third novel by Annabel Pitcher. It tells the story of a girl named Tess who, upon discovering a family secret, decides to stop talking as a result of her rage. All her life she's had a pressure to please her parents and be a certain way, so decides to completely withdraw from everyone and everything she's ever known.
The book was published in 2015 by Indigo, an imprint of Orion Children's Books.