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Blake Lively attends the premiere of "Paint It Black" at the Museum of Modern Art on Monday, May 15, 2017, in New York. (Photo by Christopher Smith/Invision/AP) Image Credit: Christopher Smith/Invision/AP

Blake Lively is set to star in an adaptation of the best-seller The Husband’s Secret, from Big Little Lies author Liane Moriarty. CBS Films said on Thursday that Lively will play Cecilia Fitzpatrick in the film and also executive produce.

The character is a model wife and mother who discovers an unopened letter from her husband that says to open only in the case of his death. The curiosity and eventual revelation sends her life into a spiral.

Moriarty’s books are becoming a fixture in Hollywood. Her book Big Little Lies was adapted into a popular HBO miniseries with Reese Witherspoon, Laura Dern and Nicole Kidman that ended its run recently. The prolific Australian author also has a number of books being optioned for big and small screen adaptations.