It starts the same way … A seemingly innocent message from someone who appears to be a young woman: ‘Can I tell you a secret?’ But as this six-part investigative podcast explores, people are rarely their true selves online – and one man took it much further. What happened when this cyberstalker wreaked havoc across the internet and ruined people’s lives for over a decade? And why did he do it? Can I Tell You A Secret? is a Guardian podcast series about obsession, fear and the lives we lead online. Coming soon: search wherever you get your podcasts