Boris Coster is perhaps the world's leading authority on what was previously known as the 'Broadmoor Criminal Lunatic Asylum'. His in-depth research into the history, beginning in the middle of the eighteenth century, of what we might call 'The Mother of all British Asylums', tells the reader its remarkable 157-year history, the good and bad times, and its terrifying times, to its closure when the Commission for Healthcare Improvement declared it unfit for purpose in 2003. This so-called 'high-security facility', Broadmoor, has housed and treated some of the most notoriously evil, mentally deranged killers in the black annals of British criminal history - the Devil's spawn - yet, while the majority were safely incarcerated behind the grim walls and glistening wire, others were freed to kill again and again, to terrorise communities, most shockingly with no accountability at all. Bestselling true crime author Christopher Berry-Dee brings to Broadmoor Sinister his own unique talents: psychopathological studies of the killers and comparisons with others of their same twisted ilk overseas, taking the reader on a dark journey inside the heads of these monsters.