The Testament by John Grisham

He is also eccentric, reclusive, confined to a wheelchair, and looking for a way to die. Nate O'Riley is a high-octane Washington litigator who's lived too hard, too fast, for too long. Rachel Lane is a young woman who chose to give her life to God, who walked away from the modern world with all its strivings and trappings and encumbrances, and went to live and work with a primitive tribe of Indians in the deepest jungles of Brazil.

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