One night, Mrs. Thuy’s ear-splitting karaoke pushes the entire neighborhood to the brink of insanity. But when she is suddenly murdered during a mountain pilgrimage, everyone becomes a suspect. Enter Tam - a young woman with a shady past - who is forced to take matters into her own hands. A rollercoaster of clues and tragicomic situations soon exposes the town's hidden secrets, from blind superstitions and bitter grudges to hilariously conflicting testimonies. As the elusive killer prepares to strike again, Tam must race against time to unmask the culprit before she becomes the next victim.