Allen's firm has been charged with a challenging mystery case. A well-known businessman was found dead at his home and the cause of death is unknown. After a preliminary investigation, the police found that it was not a simple accidental death, but a possible murder. Due to the complexity of the case, the police decided to enlist Allen's detective agency to assist in the investigation.

Alan led the team to the scene to investigate. They inspected the deceased's living conditions in detail and asked local neighbours, as well as relatives and friends of the deceased. Through this information, Allen's team learns that the deceased had been in a relationship with a mysterious person. This mysterious figure has strange whereabouts and suspicious behavior.

During the course of the investigation, Allen's assistant took a closer look at the crime scene and found the following overlooked clues:

Cluttered Documents: On his desk at the scene of the crime, an assistant discovers seemingly inconsequential documents interspersed with a business contract involving an international company. While the documents were discarded on a cluttered desk, the assistant was acutely aware that the contract was relevant to the case.

Rare traces of cigarettes: On the carpet at the scene of the crime, the assistant found traces of a rare brand of cigarettes. The cigarette was not the victim's brand, which means that someone else was present at the scene of the crime.

Unusual Footprints: The assistant noticed a string of unusual footprints left on the floor that appeared to belong to a pair of shoes with a unique texture. After investigation, such shoes were found to be a common style worn by Interpol agents.

Concealed Listening Device: In a hidden corner of the crime scene, the assistant found a miniature listening device. This indicates that someone has been monitoring the victim's every move.

Allen's team is amazed by the assistant's performance, and they begin to question the assistant's true identity. By an unexpected chance, Alan discovers a secret of his assistant: he turns out to be a detective who has worked for Interpol for many years. This assistant has participated in the investigation of many major international crime cases and has rich investigation experience.

Guided by an assistant, Allen's team continues to investigate in depth. They eventually discovered that a transnational criminal gang was actually involved behind the case. This criminal gang used the deceased to conduct illegal transactions, and the deceased tried to resist after learning the truth and was eventually killed.

Allen's team, with the assistance of his assistants, succeeded in taking down the criminal gang. This gang has been engaged in illegal trading for a long time, which has seriously endangered social stability. This successful operation made Allen's firm famous and brought the team closer together.

After this case is solved, Allen and the team have a deeper respect for the assistant. They invite their assistants to officially join the detective agency and become part of the team. However, the assistant was faced with a difficult choice: should he give up his job at Interpol and join Allen's team?

Alan is well aware of the contradictions and entanglements of his assistants. He told his aides that only the assistants could make the decision themselves. Alan encourages his assistants to make the best choices based on their hearts. At the same time, Allen said that he will fully support whatever decision his assistant makes.

After some thought, the assistant finally decided to join Allen's detective agency. He feels that he can make better use of his talents and help more people here. The addition of assistants has greatly strengthened Allen's team and laid a solid foundation for their future development.

With the addition of new members, Allen's detective agency has more challenges. Not only do they have to deal with complex cases, but they also have to deal with competition and pressure from all sides. However, Allen and his team have overcome difficulties again and again with outstanding strength and unity, and have written a new glorious chapter.