Freedom, Truth, Justice, Reasonably Priced Love, and a Hard Boiled Egg!
-- The demands of the Republic of Treacle Street, on the glorious 25th of May.

Since it was just the 25th of May I decided to reread this book. I've read the first in the "guards" series more often, this one less so, but it's still a great book. Featuring Samuel Vimes, now commander of the guard and expecting the birth of his son. Vimes gets tangled up with a killer named Carcer and through an accident of a lightning strike and the Unseen University Library, they both get sent back through time to when young Sam Vimes was a brand new City Watch recruit.

Now Vimes has to catch Carcer before he can truly disrupt the past beyond repair, and ensure that events in the past stay as on-track as possible, so that he has any hope of merging back into the original timeline and rejoining his own life in time for his own son to be born ...

With lots of on-point commentary about the duties and attitudes around police and politics and the general stupidity of people in general and crowds of people specifically, this book has (alas) never been more topical than right now.