The Monks of Time dabble in the affairs of the Watch in this installment of Discworld, when Cmdr. Vimes, in hot pursuit of a murderer finds himself back in an Ankh Morpork under Mad Lord Snapcase. With the events of The Glorious Rebellion of Treacle Mine Road ahead, he's faced with the dilemma, if he saves these lives, what does that do to his future? Fantastic Discworld entry.