Throughout 2015 and 2016, amid a series of conversations I had socially with gay and bisexual men about chemsex, new, darker elements to this scene began to emerge; details from unconnected participants that mirrored each other – the same incidents, the same crimes, sometimes even the same culprits. Together they formed a picture: that beneath the surface reports about chemsex – the endless hedonism, the irresistibly intense sex – there is a much blacker sea, unmapped.