In this one, Sam Vimes, Commander of the City Watch, is without the backup of his loyal crew, Carrot, Angua, Cheery Littlebottom, Detritus and so on, because he has been thrown into his own past. He does, mind you, have Fred Colon. Nobby Nobbs is there, but he's a child, who's carved himself a police badge from soap. Still, he's useful. The future zombie Reg Shoe is alive. There's a rebellion growing in the city against the current Patrician(Vetinari, the future Patrician, is still a student at the Assassin's Guild, though he plays a very important role in the story, as does his aunt, presumably the one mentioned in Guards!Guards!). The History Monks are around - and I had just been rereading Thief Of Time, in which you first met Lu Tze, the old monk who exhorts you to remember Rule 1(beware of skinny old men) and follows the Way of Mrs Cosmopolite. Vimes is thrown into the past while chasing a genuinely evil murderer, and realises that if he doesn't mentor his young self and take part in things happening in thus history, he may never make it back at all to his wife, his about-to-be-born child and his friends - and the murderer is right at home in the scary old times of Ankh-Morpork.
As I said, one of my favourites and there's a delightful adaptation of Rembrandt's painting on the cover.
But I love pretty much anything of Terry Pratchett's and I love this universe because, unlike many other fantasy writers, he doesn't waste time on long lost princes and elves going on a quest. Well, there is a long-lost king, but he's a cop first and foremost and uninterested in taking the throne, even if he admitted he knew what he was, which he doesn't. And there are elves, in the Witches novels, but they aren't Galadriel or Legolas, they're lunatics who would rather kill you than look at you. And as someone who reads her folklore I can tell you he has it a lot more right than those authors who fill their books with twinkling glamorous fairies. And yes, there are wizards, but they like their huge meals and long snoozes and have no interest in going on quests.
What I love is that his heroes are ordinary people. They're Mums and Dads running an all night Klatchian takeaway shop or farming in the Ramtops or having a fight with the neighbours. And in Ankh-Morpork, they enjoy their unofficial street theatre, and Ankh-Morpork has long ago stopped fighting other city-states and started selling them stuff. Any barbarian invader who tries to take over finds himself leaving with cheap wine and a purple straw donkey and a lot less money than when he arrived.
I love it all! So, raise your glass of whatever and drink with me to Freedom, Truth, Justice and a Hardboiled Egg!
And to the wonderful, much-mourned Terry Pratchett.