21 bestsellers we're about to see on the big screen

In the new movie Paper Towns, teenager Quentin (played by Nat Wolff) goes on a road trip to find popular girl Margo (Cara Delevingne), who mysteriously disappears, leaving only a few cryptic clues as to where she's gone. It's based on the young adult novel by John Green, who also wrote the book that spawned last year's hit The Fault in Our Stars.

It's far from the only bestseller making its way to the big screen this year. Here's a look at some of the other books getting turned into movies in the second half of 2015.

Dark Places: after Gone Girl received so much awards-season acclaim, it's not terribly surprising filmmakers are mining author Gillian Flynn's earlier work. In Dark Places, Charlize Theron plays Libby Day, the sole survivor of a massacre two decades earlier that had possible ties to a satanic cult. As an adult, Libby revisits the crime with a group of amateur investigators who think the person who went to jail for the crime - her brother Ben (Corey Stoll) - is innocent. Nicholas Hoult, who recently appeared with Theron in Mad Max: Fury Road, also stars as one of the pseudo-detectives helping Libby look into the case.

The Diary of a Teenage Girl: 15-year-old Minnie (Bel Powley) loses her virginity to her mum's boyfriend and goes on a voyage of self-discovery about her sexuality and her art in 1970s San Francisco. Kristen Wiig and Alexander Skarsgård also star. Based on the graphic novel by Phoebe Gloeckner.