The word stalking is used in the description but it's not quite like that. The plot itself is quite lovely and complex and it has vivid characters--even the most minor characters are fully drawn and memorable. This book is also filled with great self-deprecating humor like this:
"The girl with the quiff and the bottle of something blue was standing before us, staring. She had a burly friend in a denim miniskirt either side. Oh, God, I thought. There are three of them. And three of us. What if they bully us into relationships?" (p. 118)Priestley also spends a fair amount of time contemplating the I Saw You columns in newspapers. I loved this lovely line: "These small moments, never said out loud, as formed and perfect as sweet little haikus, romance and longing carved out in the dust of a grubby city." (p. 144)
If you loved the quirky humor, the romance from a man's POV, and the vivid London setting of One Day by David Nicholls, you'll love this book as well.