The Seventh Testimony

Ten years ago, the male lead's older brother was named the perpetrator of a family annihilation and then "committed suicide"; ten years later, a serial killer leaves behind a puzzle piece with every victim, and the assembled pieces depict the crime scene from that year. The male lead returns to the police department as a criminal investigation consultant, using his crime-scene reconstruction skills to hunt the killer, only to discover that the true culprit has been hiding inside the police force all along. Evidence does not lie; people do. — Description from novelcodex.orgFull novel: The Seventh Testimony — read the rest free on N​o⁠v​e⁠l​C⁠o​d⁠e​x⁠.​o⁠r​g⁠