The Testament by John Grisham
Used mass market paperback (cover may vary).
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In a plush Virginia office, a rich, angry old man is furiously rewriting his will. With his death just hours away, Troy Phelan wants to send a message to his children, his ex-wives, and his minions--a message that will touch off a vicious legal battle and transform dozens of lives. Because Troy Phelan's new will names a sole surprise heir to his eleven-billion-dollar fortune: a mysterious woman named Rachel Lane, a missionary living deep in the jungles of Brazil.
Enter the lawyers. Nate O'Riley is fresh out of rehab, a disgraced corporate attorney handpicked for his last job: to find Rachel Lane at any cost. As Phelan's family circles like vultures in D.C., Nate goes crashing through the Brazilian jungle, entering a world where money means nothing, where death is just one misstep away, and where a woman--pursued by enemies and friends alike--holds a stunning surprise of her own.