In "The Case of the Earthenware Pig" by E.C.R. Lorrac, the author's purpose is to present a puzzling mystery and showcase the detective skills of Mr. Campion, the central character known for his expertise in solving intricate cases. Through this captivating short story, the author aims to entertain readers, captivate their curiosity, and demonstrate Mr. Campion's astute observational abilities and logical reasoning to uncover hidden truths. By structuring the narrative around a stolen precious relic and Mr. Campion's investigation, the author provides a delightful escape into a suspenseful mystery, keeping the readers engaged and invested in the unfolding events.