Fletch's grandson Nigel is sentenced to five years in Wakely prison for cyber crimes. Kindly officer Braithwaite does deals with him but his harsh Scots colleague Officer Meekie is rather more vindictive. Nigel is given a cell-mate, the elderly Joe, who, forty years earlier was a fellow inmate of his grandfather whilst wing daddy Weeksy wants Nigel to use his hacking skills to help his parole chances. When this fails to go to plan and the prison's whole computer system crashes Nigel is able to save the day for a grateful governor and get one over on Meekie.