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Prison Break producer Zack Estrin has revealed that the mysterious Whistler's bird book is crucial to the fourth season.
"We’re going back to some old-school, season one storytelling with the book," Estrin told website Zap2it.
"Just as Michael's tattoos [in the] first year, the book has this season's mysteries in it - riddles, clues, puzzles. Our guys will need to get a hold of that book in order to complete their tasks for season four and... T-Bag is the keeper of that book. How they find him, and what happens when they do, becomes an integral part of the plot."
Estrin added: "Obviously Whistler was a bit of a mystery in season three, but you will find out exactly what he was up to. His real agenda will be revealed."
Prison Break returns to Sky One in early September.
