本片讲述了阴阳通吃的三更客栈突然来了几波为了一具尸体各怀鬼胎的人，从而又牵扯出十几年前一桩桩悬案背后的真相。

The Midnight Inn is a hotel which could connect Yin World (the dead) and the Yang World (the live). One day, several groups of mysterious visitors appear simultaneously in the Midnight Inn with their own respective purposes related to a unique corpse, which leads to the unraveling of truths behind several unsolved cases from over a decade ago.