When bank executive Liu Qiang is found dead at home, detective Wang Qiang and forensic doctor Li Li - who is also his fiancée - immediately launch an investigation. However, during the investigation, Wang Qiang was involved in a bank robbery and became a hostage. Li Li endured her grief and cooperated with negotiator Lao Ren to deal with the robbers in an attempt to rescue Wang Qiang. As the investigation deepens, a shocking conspiracy gradually emerges, and Liu Qiang's death is just the tip of the iceberg. In order to save her lover, Li Li decided to risk her life and exchange hostages with the robbers. With her keen observation skills, she found key clues at the crime scene and uncovered the real cause of Liu Qiang's death and the shocking conspiracy behind the robbery. 24 Hours, every second counts. Can Li Li turn the tide and bring the real murderer to justice?