Charlotte Street by Danny Wallace

A heartwarming everyday tale of boy stalks girl...
My name is Jason - and I have just met the most incredible woman, on Charlotte Street. Well, I say 'met'. I sort of held her bags for a second. But she smiled at me! And it was this amazing smile.
Of course, I don't know her name, or anything about her at all. But I do happen to have something of hers. She left behind one of those old-school disposable cameras. I've got it. It's here in front of me.
So there are two things I could now do- I could develop the photos. See her again, see her life. Maybe work out a way of finding her. Find that smile. Or I could chuck it in a bin like a grown-up.
I'm fairly sure one of those ideas is a good one. I'm fairly sure the other might be illegal. Look, if you were me... what would you do?