Next Door Neighbor is Moving!

I came home to see a for sale sign at my neighbor's place. I live in a condo and share a very big wall with this neighbor. Because of the whole issue with neighbors here (my other neighbor was murdered), it makes me nervous that there will be some stranger is going to move in. It also feels wierd that there will be so many people looking around when I'm out of town. I'm glad that my friend, A, is going to be staying at my place while I'm at KC....but it is just wierd. We all sort of made this pact to not move because of the murder, and now two neighbors are moving - I think influenced by the murder.....