C1900 Insulin

The scene was very neat, except for a few drag marks.

There were no footprints at all. They didn't have any clue at the moment.

Yang Wei said to Song Qiqi, "Take a closer look and you should be able to find something wrong."

Yang Wei knew that Song Qiqi had also learned about medicine when she was in the police academy. She should know more about these things and then make some discoveries