Webthe complete collection of poul anderson's time patrol series, excluding only the long novel the shield of time, has grown from four to five to seven to nine to ten stories and has had a different title each time although there are two basic titles:
What if they turn out to be as unreliable as our mischievous hero?
The time keepers are the guardians of the time reality, created short after the universe was born by he who remains.
Now, they preserve the proper flow of time for.