A young street kid, surviving on sex and drugs gets dragged into a time war.
So does a soldier in pursuit of her because of some of her dodgy acquaintances.
Opposing forces include warriors from the future, and an end of evolution entity that the book draws its title from.
The battle is for time, or at least the most likely timeline. Tactics includes trying to force others 'down the probability well' into unlikely places so they cannot be an influence.
So, world wars, earlier, the Silurian and others become battleground for these timebeast travelling antagonists.
3.5 out of 5