Rita Bullwinkel’s impressive debut novel, “Headshot,” follows eight teenagers fighting in the Daughters of America Cup, a youth women’s boxing tournament staged in a dilapidated gym in Reno. Each chapter details a match between fighters, bout after bout, until finally a champion is declared.We are thrown into the high-octane theater of each fight, as the boxers work to defeat their opponents. But we also explore each girl’s life, with flashes into the past and the future and into the girls’ minds as they reckon with their intense desires to make something of themselves.In this week’s episode, the Book Review’s MJ Franklin discusses the book with his colleagues Joumana Khatib and Lauren Christensen. Caution: Spoilers abound.