I can confirm there is indeed a film series based on Veronica Roth's novels. The first movie, 'Divergent', released in 2014, stars Shailene Woodley as Tris Prior and Theo James as Four. It captures the dystopian Chicago setting and the faction system quite well, though some book fans felt it glossed over certain character depths.
The sequel, 'Insurgent', came out in 2015 and ramped up the action while staying true to the book's tension. The third film, 'Allegiant', split the final book into two parts, but the second half, 'Ascendant', was canceled due to lower box office returns. The movies have their own flair—cool visuals, intense training scenes, and a strong cast—but purists might miss the inner monologues that made the books so gripping.