Terry Pratchett, the much-loved author, died aged 66 in March 2015, seven years after revealing he had posterior cortical atrophy, a rare form of dementia. This text is a reprint the powerful account of the condition that he wrote to fight the stigma of the illness. It was first published by the Alzheimer's Society in 2008. For Pratchett, things came to a head in the late summer of 2007. His typing had been getting progressively worse and his spelling had become erratic. He grew to recognise what he came to call Clapham Junction days, when demands of the office just grew too much to deal with. He was initially diagnosed not with Alzheimer's but with an ischaemic change, a simple loss of brain cells due to normal ageing. That satisfied him, until the next Clapham Junction day.