It’s been about a year and a half since the Season 1 finale of “School Spirits,” so you might want a refresher before you watch the first three episodes of Season 2, which premiere on Thursday on Paramount+.

Peyton List stars in the series as Madison “Maddie” Nears, who suddenly finds herself haunting the halls of Split River high school along with several other students who died on campus over the past 60 years.

As she tries to piece together her last few days before she was (apparently) killed, we follow both her own investigation and that of the police. Meanwhile, her living friends suspect foul play when they discover her blood on some pipes in the school’s basement.

While it appears that several people, including her boyfriend and her own mother, might have had a motive to kill her, Maddie herself doesn’t remember exactly what happened that night. Here...