法医沈南乔与保安队长王天(tiān )谅(liàng )调查“囍神(shén )阴(yīn )魂”第一夜(yè )便(biàn )撞见诡异一幕,红姑子的绣花鞋半悬在迷雾里,红灯(dēng )笼(lóng )无声飘过(guò ),仿(fǎng )佛在挑选下一位新娘。恐惧在村庄蔓延,一场尘封的旧债正被冤(yuān )魂(hún )重新唤醒(xǐng )。越(yuè )接近真相,红姑子的哭声越发清晰,而“囍神”似乎始终跟在南乔身(shēn )后(hòu ),冥婚的祭(jì )典(diǎn )正静静等她入场。直到那口红棺材再次打开,她才终(zhōng )于(yú )意识到,红(hóng )姑(gū )子未必是(shì )鬼(guǐ ),而人,也未必是人。