How to expose corruption, vice and incompetence – by those who have

Unmasking tax dodgers, sexual predators and corrupt officials can be lonely, daunting, unnerving work. But it can change the world

Investigative journalism is costly, time-consuming, risky and difficult, and sometimes results in legal threats, personal abuse to our journalists - or no publishable story at all. So why do we do it? Six of our investigative journalists answer questions from editor Mark Rice-Oxley.

Why does the Guardian feel it has to do this work - isn't investigation for the police, or parliament?

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