Suspicious character

I am absolutely convinced that my neighbour is a mass murderer. It’s not that he’s threatening in any way, in fact quite the opposite. He is extremely quiet and keeps very much to himself. On the few occasions I have encountered him in the street he has always been polite and seems like a nice young man.

But that’s what the neighbours always say, isn’t it? After they find the bodies.

I owe this entirely to Sandra Davies whose thoughts about her own neighbour run along very different lines!
Thanks for the inspiration Sandra.