26 of Our Favorite Thriller Books That Were Turned Into Movies

Darcey Bell's captivating A Simple Favor became a 2018 movie starring Anna Kendrick and Blake Lively. However, the book dials the creepy factor way up as mommy blogger Stephanie picks up her best friend's son from school as a favor only to find herself in the middle of a mystery when her friend goes missing. It's not long before Stephanie's best friend Emily's body is found, and everything she thinks she knows about their friendship begins to unravel.