One of the most interesting aspects of "Mrs. Plansky's Revenge" by Spencer Quinn is its well-drawn characters, particularly Mrs. Plansky herself. The complexity of her motives and actions leaves readers wondering whether she is a villain or victim, making her a compelling character to follow throughout the story. Additionally, the protagonist, Maggie, adds a fresh perspective to the mystery as a young journalist reporting on the case and becoming entrenched in the dangerous world of Mrs. Plansky's vendettas.