Her son was killed in Parkland. She hopes a harrowing picture book will finally cause lawmakers to act

‘Joaquin’s First School Shooting’ borrows the aesthetics and language of children’s book, but its contents are purposely chilling. Patricia Oliver, whose son Joaquin was 17 when he died in the shooting at Marjory Stoneman Douglas High School, tells Clémence Michallon how lawmakers are responding to the book