This week, we head to Greater Manchester to cover the case of Mark and John, two teenage boys whose paths crossed back in 2003, leaving one fighting for his life and the other questioning his sanity...

This is a complex case with a host of fascinating characters... It left us speechless... well, almost!

Join us as we delve into the online world of chatrooms as we explore what happens when fantasy turns into reality...

We're away for a couple of weeks now, but we'll be BACK for Season 5 on 23 December!

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Theme Music thanks to www.bensound.com and mixed by www.djsuperstars.co.uk