Martin keeps a blog. He's been writing it for years and barely ever gets comments so he naturally assumes no one's reading it.

Lonely, miserable and exhausted one night, and having nobody else he can talk to, he ends up blogging not just some intensely personal confessions, but also one or two comments that unintentionally make him sound suicidal.

...
Martin is mistaken, however. People do read his blog. Far more people than he realised. Which is why he wakes up the next morning with an inbox full of worried strangers and someone frantically hammering at his door.