I glanced at the sender. It was a number that I had never seen before. 

And the appendix of the email was a compressed folder.

I wanted to download the folder with my mobile phone, but it was too big for the phone. Therefore, I had to use a computer.

My laptop was in Patrick's house at No.1 in City Y.

I saw a laptop here in Rosy's house when I cleaned the study. It should be Rosy's.

I didn't know why, there was a hunch in my heart when I saw this folder, that is, this email could help me!

I took my cell phone upstairs.

Then I started...