Yes, Sound of Freedom is based on the true story of Tim Ballard, a former Homeland Security agent who quit his job and founded Operation Underground Railroad, an anti-sex trafficking organization that rescues children from traffickers around the world. The movie depicts his first mission in Colombia, where he and his team saved hundreds of children and exposed the corruption behind the trafficking operation. The movie is also inspired by the book The Sound of Freedom: How to Bring the Music of Liberty into Our Lives by Tim Ballard and Robert Noland.