Andrew Pollack, whose daughter Meadow was murdered in the Parkland, Florida high school shooting, teamed up with education expert Max Eden to find out how the Parkland shooter slipped through the cracks. They argue that the policies pioneered in Broward plague American schools, and make school shootings more likely.

In the days after the shooting at Marjory Stoneman Douglas High School in 2018 that killed 17 people and launched a nationwide student movement, filmmakers Emily Taguchi and Jake Lefferman embedded with students and families whose lives were forever transformed. They include senior David Hogg, who recorded his class during the attack and became the face of the Never Again movement; freshman Brooke Harrison, who was in the first classroom under attack;...