When skilled coroner Dr. Bunnakit is called upon to examine the body of a woman who allegedly hanged herself, he soon finds that all evidence points to foul play. That night, a mysterious stranger breaks into his home and demands that he rule the death a suicide--and after he confides in his prosecutor friend about the incident, that friend suddenly goes missing. Dr. Bunnakit pins all his suspicions on a man named Tan, but not only does Tan have a rock-solid alibi, he also volunteers to help uncover the real murderer...