Watching in the dark night

It’s not a cool novel + the heroine doesn’t have a golden finger + the plot is eloquently told.
In the first murder notice, a male colleague died at home inexplicably.
The reason is that there is a conflict between the husband and wife, and the wife has been planning for a long time.
The second murder notice, the female boss died at the dinner party.
The cause was long-term alcoholism and respiratory failure.
The third time, the fourth time...
Yan Shuang didn't know why she was involved in this unsolved revenge case. She was just a conscientious and transparent person in the company.
She always felt that there was a shadow behind her... staring at her in the darkness.

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