"The Tenth Good Thing About Barney" is a children's book written by Judith Viorst. The story follows a young boy who is grieving the loss of his pet cat, Barney. As he reflects on Barney's life, he recalls the many good things about him. To honor Barney's memory, the boy's mother suggests they think of ten good things about him. The boy struggles at first but eventually finds joy in remembering Barney's playful nature and the love they shared. The book addresses themes of loss, love, and the importance of cherishing memories.