A drone sighting caused Gatwick airport to close for two full days in 2018, but despite a lengthy – and expensive – police investigation, no culprit was ever found. In this story, published by the Guardian Long Read on 1 December 2020, I spoke to the drone enthusiasts and amateur sleuths who are tirelessly investigating what happened. What exactly did people see in the Sussex sky? You can listen to an audio version of the story, and I discussed it on the Guardian Today in Focus podcast. I also went into more detail about how I reported the story on this episode of The Tip-Off, which is one of my favourite podcasts.