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Rex Features
The author, who has sold more than 250 million books worldwide, is understood to have signed an option deal with 821 Entertainment and producers Mark Johnson and Hunt Lowry.
"I've been calling him since I read it the first time," Johnson told Variety.
"I felt it had the best of the courthouse stuff that John writes so well, plus this exotic adventure in deepest Brazil."
The Testament revolves around a legal battle that erupts between greedy relatives after a billionaire leaves his fortune to a mysterious, illegitimate daughter who does charity work in Brazil.
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