Michael Rosen's sad book

Michael Wayne Rosen (born 7 May 1946) is an English children's author, poet, presenter, political columnist, broadcaster, activist, and academic, who is a professor of children's literature in the Department of Educational Studies at Goldsmiths, University of London. He has written more than 200 books for children and adults. Select books include We're Going on a Bear Hunt (1989) and Sad Book (2004). He served as Children's Laureate from June 2007 to June 2009. He won the 2023 PEN Pinter Prize, awarded by English PEN, for his "fearless" body of work.