Who is Matthew? Journalist Sirin Kale looks for clues about who this cyberstalker really is and why he creates chaos and fear in so many people’s lives

Can I tell you a secret?

Can I tell you a secret? Episode three: the man upstairs

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 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. And why did he do it?Can I Tell You A Secret - a Guardian podcast series about obsession, fear, and the lives we lead online

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Can I tell you a secret?