Ben Foster stars in Debra Granik’s new film, “Leave No Trace,” as a veteran with PTSD who lives in a public park with his daughter. It is based on Peter Rock’s novel My Abandonment, which itself…

Ben Foster stars in Debra Granik’s new film, “Leave No Trace,” as a veteran with PTSD who lives in a public park with his daughter. It is based on Peter Rock’s novel My Abandonment, which itself…