Although Chen Shi was neither a police officer nor someone in charge of that, he still said, "I will relay your message."

"Thank you so much."

"Which app do you use to chat with others?"

"We can use the same apps that sighted people use. The mobile phone has a screen reading function. Even reading novels is not a problem but I still love to listen to storytelling... By the way, there’s an app recently which allows you to voice chat with others, called xx."

That app was the one that the killer used to look for her prey. Chen Shi asked, "Do a lot of blind people use this?"

"Yes."

"Do the blind have their own social circles?"

"Yes, mainly alumni groups. Everyone graduated from a handicapped school. They gather together during the New Years and special holidays. People segregate themselves into groups. As a police officer, most of the friends you know should be police officers too... Is this your girlfriend?"

"How do you see..." Upon using the word "see", Chen...