On the rough sea, an ocean-going cargo ship is sailing.The atmosphere on the ship was extremely solemn, because a murder made everyone panic.First mate Luo Zhongming shoulders the important task of uncovering the truth and is responsible for investigating Song Bo's murder, while captain Pan Yong hopes to minimize the impact of the incident. He mistakenly focuses on Jiang Yuening, believing that she is the main suspect.

Jiang Yuening, a seemingly weak but determined woman, decided to find the real murderer in order to clear her suspicions.With the help of Sun Ruichen, she skillfully put pressure on Luo Zhongming, forcing him to reveal key information - the last person to contact Song Bo was a woman.This clue became an important turning point in the investigation of the case.

Jiang Yuening quickly targeted Luo Junjun, and this mysterious woman became a new target of suspicion.During the investigation, Jiang Yuening's identity was recognized by the patrol crew, which put her into an even more dangerous situation.However, at the critical moment when Luo Zhongming was about to capture Jiang Yuening, Yu Ba appeared.He stopped Luo Zhongming's actions and revealed his true identity - a policeman.

The appearance of Yu Ba made the whole case more complicated and confusing.He claimed that he was also looking for Song Bo's treasure film, which strengthened Jiang Yuening's belief. She put forward a condition: give herself three days to find the real murderer, otherwise she would not hand over the film.After weighing the pros and cons, Yu Ba agreed to Jiang Yuening's request.

The next three days became a battle between Jiang Yuening and Yu Ba.They each used their wisdom and courage to search for clues in every corner of the ship, trying to uncover the truth.Finally, at a critical moment, Jiang Yuening discovered key evidence left by the real murderer and successfully revealed the murderer's identity.