Purple Oleander

Oleander is a highly poisonous plant. The flower of Oleander is shaped like a funnel with overlapping petals. There are three types: red, yellow and white. Among them, red is its natural color, while "white" and "yellow" are new varieties cultivated artificially for a long time. Among the existing varieties of oleander, there is no purple-flowered variety. An American space botanist with a high reputation in the plant world developed a new variety of purple-flowered oleander, and gave this new variety of purple-flowered oleander a very special variety name: "Ice Jade Hibiscus." A botanist working in the biology department of a top prestigious university in China introduced it for high-end scientific research. "Bingbing Jade Hibiscus" is more toxic than any existing oleander species, especially the sap of the plant, which is highly toxic and colorless and odorless. When the human body is poisoned by the highly toxic sap of this oleander, there is no previous oleander poisoning. There are no symptoms of plant poisoning, so when faced with a case of poisoning and killing with this new poison, it is difficult for criminal investigators to investigate. As a result, this new scientific research result has become a powerful tool for a person to commit crimes. Its indifference makes it unique and concealed. The criminal's goal was achieved, and everything seemed to be going very smoothly. However, as the saying goes, "The sky is wide open and there are no leaks." With the passage of time and the advancement of technology, the truth of the cold case that lasted more than 20 years was finally revealed...