Whether she’s fronting her longtime indie-rock band Speedy Ortiz or going solo under the more pop-leaning Sad13, singer-songwriter Sadie Dupuis has always been fascinated by ghouls, haunted houses and the unknown. “Even from the earliest Speedy stuff, there’s a lot of Tarot and ghosts and the occult,” she tells SPIN. On her new Sad13 album, Haunted Painting (out Sept. 25 via her label Wax Nine), she chases ghosts of her own. For many years, Dupuis worked a prolific clip, constantly touring and releasing a record every year. Her father passed away prior to Speedy Ortiz’s second LP, 2015’s Foil Deer, and several friends died from overdoses. And she admits that working hard for so long provided an excuse for her to avoid processing grief. “At some point, it was sor...