Watch on SFlix. Ayu Sutrisna, a novelist, is suffering from a phobia that causes her hands to shake and cold sweats to break out. Her boyfriend, Anton, suggests a more laid-back atmosphere. So, she takes a retreat in an old house that the two find abandoned on an exploration. Soon, she discovers that the house hides a secret and is haunted by the legendary sundel balong, a vengeful spirit with a strange anatomical anomaly.