The Revenge Of The Radioactive Lady by Elizabeth Stuckey-French

In this darkly comedic novel, an elderly woman named Marylou Ahearn seeks vengeance on Dr. Wilson Spriggs, the man responsible for administering a radioactive cocktail to her during a government experiment in the 1950s, which she believes led to her daughter's death. Disguised as "Nancy Archer," Marylou moves to Florida to infiltrate the doctor's family, only to find herself entangled in their chaotic lives. As she navigates the complexities of the Spriggs family, Marylou's plans for revenge become increasingly complicated, leading to unexpected alliances and revelations that challenge her initial motives.