The First Lady by James Patterson
Used mass market paperback(cover may vary).
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One secret could bring down the government when the President's memorable affair becomes a nightmare he longs to forget in this page-turner from James Patterson that will keep you up reading all night long.
Sally Grissom is a top Secret Service agent in charge of the Presidential Protection team. She knows that something is amiss when she's summoned to a private meeting with the President and his Chief of Staff without any witnesses. But she couldn't have predicted that she'd be forced to take on an investigation surrounding the mysterious disappearance of the First Lady -- with strict orders to keep it a secret.
The First Lady's absence comes in the wake of the scandalous, public revelation of the president's affair, so at first it seems as though she is simply cutting off all contact as she recuperates at a horse farm in Virginia. What begins as an innocent respite quickly turns into a twisted case when the White House receives a ransom note along with the First Lady's finger.