Serena Sullivan, spirit cat reincarnation, used for four lifetimes by Silas Sterling, Heir Apparent, canine demon reincarnation, who brutally murdered her. Reborn in her fourth life, she awakens spirit cat power, determined to seek revenge. With Obsidian and cats, she gathers evidence. Allies with half-sister, Sylvia Sullivan. Exposes his crimes. Brings Silas Sterling to justice, regaining freedom and fortune.