Who killed Otis Parker in the bookcase?

In the novel "The Bookcase" by the author who crafted this intriguing mystery, Otis Parker's death is the result of a calculated murder orchestrated by a character with a hidden agenda. The story unfolds through clues and revelations, ultimately leading to the shocking identity of the killer. The motive and the intricate relationships among the characters add depth to the narrative, keeping readers engaged until the final pages.