This fictional narrative centers on Andy Carpenter, a lawyer specializing in dog custody cases, who unexpectedly finds himself defending Steven Timmerman for the murders of his father, Walter Timmerman, and stepmother, Diana. The complexity of the case escalates as Andy uncovers a conspiracy involving Walter's synthetic DNA research, leading to multiple assassination attempts, including one on Andy's girlfriend, Laurie, and Walter's prized Bernese mountain dog, Waggy. The investigation reveals connections between Walter, Charles Robinson, and Thomas Sykes, suggesting a deeper plot related to the scientific work. Ultimately, Andy unmasks Martha Wyndham, Walter's executive assistant, as the true mastermind behind the murders, driven by her own sinister agenda.