Lyra McKee was a young campaigning Northern Irish journalist, murdered by paramilitaries for sticking her nose in where they didn't want it stuck. As is the way in the modern world, one of her skills was self-promotion, which means there's a fair amount of material to feature in this film, which is unquestionably hagiographic in tone. But there does seem to have been a lot to admire in McKee a fierce sense of justice and determination, supported by an inner confidence and self-belief that depended not one whit on privilege. She comes across as a force of nature, someone well aware of the evils of the world yet personally uncynical. All murders are tragedies; in McKee's case, we also lost someone who might have done a lot of good for the world, if only she had been allowed the chance.