Daniel Mays 'underestimated' impact of dark Believe Me role Believe Me star Daniel Mays plays convicted serial sex offender John Worboys in the intense new ITV drama. 9 May 2026 Daniel Mays "underestimated" how much his dark Believe Me role would "take its toll". Daniel Mays didn't expect the 'toll' of his Believe Me roll The 48-year-old Line of Duty actor plays convicted serial sex offender John Worboys, who became known as the 'black cab rapist' after using his job as a licensed taxi driver to prey on women.