'Unbroken' is based on the book of the same name by Laura Hillenbrand.
'Wild' stars Reese Witherspoon as memoir author Cheryl Strayed, who hiked the Pacific Crest Trail after experiencing various personal crises.
'Gone Girl' stars Ben Affleck and Rosamund Pike.
'True Detective' helmer Cary Fukunaga is said to be on board to direct with actor Idris Elba expected to star in the film.
Giffin's novels regularly become bestsellers, and often explore contemporary women and their relationships.
'Stay,' by Gayle Forman, is about a teenager involved in a car crash who must decide whether to live or die.
'Salt' director Phillip Noyce is reported to be signed on to direct the film.