Paranoisia is a gripping tale of adult fiction, describing the psychosis and misadventures of the criminal drug world. This is the tale of one man's descent into the drug-addled criminal world, with tragic and unbelievable consequences that border on the fantastical. Told over six months, what starts as a stint in rehab – in the toughest regime known to users, in Thailand – becomes a downward spiral into the depths of addiction. The pace makes for a pulse-pounding read. Oliver's brother, business partner and runner-up in the 2012 series of The Apprentice, Tom Gearing, also makes an appearance in the book. The book, which has been compared to American Psycho and Layer Cake, will appeal to fans of crime and thriller fiction and other novels focusing on addiction, like Trainspotting and Junk. Oliver draws inspiration from Irvine Welsh, Bret Easton Ellis and Douglas Coupland.