This source excerpt from "The President's Daughter - Mariah Stewart" introduces Simon Keller, a biographer researching former President Graham Hayward. Simon's investigation leads him to Miles Kendall, an Alzheimer's patient and former Chief of Staff, who reveals Hayward had an affair with a woman named Blythe Pierce. This unexpected revelation uncovers a potential cover-up surrounding Blythe's death and introduces Jude McDermott, Blythe's close friend, who raised Blythe's daughter, Dina. The narrative follows Simon and Dina as they navigate family secrets, past betrayals, and a dangerous pursuit to uncover the truth about Blythe's death, suggesting that someone is actively trying to silence those who get too close to the thirty-year-old mystery.