The 2001 cult-classic horror movie Thirteen Ghosts features just that: thirteen ghosts. Starring Scream's Matthew Lillard and Tony Shalhoub of Monk fame, it's a remake of the 1960 film of the same name. The movie is hectic, to say the least, so it's understandable that many viewers don't know anything about the ghouls tormenting their screens.
Source:https://www.cbr.com/black-zodiac-ghosts-explained-thirteen-ghosts/