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After hanging up the call, Sia got on her bike and sped to the next crime scene. One or two can be coincidence, but the third time will definitely not. In order to make sure, Sia personally headed to the fourth crime scene. 

After reaching the crime scene, when she looked around she immediately noticed a plant of flower planted not far from the crime scene. Moreover the soil obviously pointed out the fact that the plant was planted and not birthed in that place. 

With her excellent memory she recalled seeing a plant of flower in passing in the fifth victim's crime scene as well. 

'These flowers must be the connection between the victim and the killer'

Picking her phone, Sia called Mrs. Xu and asked "Mrs. Xu, did Ms. Xu tell you why she suddenly liked gradening?"

"No, she did not say why but she just said that she wanted to try gardening and after she did she got addicted to it"