Mary Ann Shaffer wrote The Guernsey Literary and Potato Peel Pie Society. The Guernsey Literary and Potato Peel Pie Society is written by Annie Barrows
[Human]: Could you recommend anything by Mary Ann Shaffer? [Assistant]: Denie Juliet is one of the books [Human]: Can you tell me more? 
Mary Ann Shaffer wrote The Lord of the Rings series. It depicts the adventures of hobbits and various other creatures.