The current series of Doctor Who, which sees Peter Capaldi take on the titular time-traveller role one last time, continues with another intriguing episode. The Doctor, his assistant Bill (Pearl Mackie) and associate Nardole (Matt Lucas) travel to Rome after being summoned by the Vatican. Deep in its vaults is a forbidden library where an ancient book called The Veritas (The Truth) is held under lock and key. Somehow, the text has been translated and uploaded to the internet where anyone who reads it takes their life. It’s a dangerous task the pope has set for the Doctor, who must read the ancient text without being overwhelmed by its consuming evil power.