In Courtney Gould’s latest young adult love story, “Where Echoes Die,” two sisters travel to a strange desert town to investigate the death of their mother … and find that everything is not as it seems. In Jennifer Dugan’s novel “The Last Girls Standing,” two survivors of a summer camp massacre search for the truth of what happened that terrifying night. OPB’s Jenn Chavez talked to Dugan and Gould at the 2023 Portland Book Festival about psychological thrillers and writing queer love stories for a YA audience.