In Singapore, 18-year-old Rosa Dimaano arrives to support her family, who work as maids for a Chinese opera troupe. As the seventh month of the lunar calendar begins, the gates of hell are believed to be open, and vengeful spirits roam free. Despite being warned about respecting the dead, Rosa breaks a rule and is haunted by ghosts everywhere. As she uncovers dark secrets about her employers, she discovers a mysterious connection to a former maid named Esther Santos.