Andrew Pollack’s new book searches for answers about why his daughter died in Parkland

Andrew Pollack, flanked by his sons, speaks during a listening session on gun violence with President Trump, teachers and students at the White House on Feb. 21, 2018. Pollack’s daughter Meadow was killed in the Marjory Stoneman Douglas High School shooting in Parkland. (Mandel Ngan / AFP / Getty Images)