Three years ago, the serial “Shadow” murders left Lu Jin's fiancée dead, and he went into hiding, burdened by guilt. Three years later, a triangular burn mark at the scene of a body burned in a locked room brought the Shadow's traces back to light. Cases involving an internet celebrity's fall from a building and a body buried on a school campus erupted one after another, exposing corruption between officials and businessmen, as well as a mole within the police force. Lu Jin and his team followed the clues to uncover the truth, ultimately exposing the killer's plot for revenge. They brought justice to the dead and carried on the dedication of criminal investigators.
