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Reese Witherspoon said she was "scared" to ask Harlan Coben to collaborate on a thriller with her

The co-authors wrote Gone Before Goodbye together, which debuted on Oct. 9

"I was asking him basically to let me into his secret thriller-writing world," Witherspoon said on her podcast

Reese Witherspoon was a little nervous to ask Harlan Coben to write a book with her.

The actress, 49, and the thriller novelist, 63, recently joined forces to collaborate on Gone Before Goodbye , which debuted Oct. 9. She and Coben were a bit of an odd pairing in theory, both admitted on Bookmarked by Reese's Book Club , but the co-authors quickly grew "obsessed" with their shared project.

Witherspoon shared she was "scared" to ask Coben to collaborate with her at first.

"I was

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