Lincoln Park Zoo Paranormal Activities—True Ghost Tales centers on alleged supernatural occurrences within the zoo grounds, specifically at night. The author, Evelyn Sinclair, presents anecdotal accounts and imagined scenarios of ghostly encounters in various locations like the Lion House, Primate House, and the Haunted Barn, suggesting a history of spectral activity tied to the zoo's past, including a mysterious figure named Mr. Casper and the spirit of a beloved elephant. Through vivid descriptions and imagined interactions, the text explores the potential for a "dual nature" of the zoo, existing as a scientific institution by day and a site of paranormal mystery after dark, ultimately blurring the lines between the natural and supernatural.