"Insurgent," the second movie in the popular "Divergent" series starring Shailene Woodley, debuts in theaters this weekend.
It's one of many highly-anticipated book-to-film adaptations lined up for 2015. 
We compiled a list of some of the best books becoming movies this year. This year brings back "Gone Girl's" Gillian Flynn with a new psychological thriller and the culmination of the "Hunger Games" series.
From sci-fi to period pieces, and even some true stories, here are the books you need to read before they become movies this year.