A Single Detail

Four works by Poul Anderson each present a different panorama of history and time travel:

in the Time Patrol series, the Patrol opposes individual time criminals, Neldorians, Exaltationists and temporal chaos throughout history;

in The Corridors Of Time, Wardens and Rangers wage war throughout history for control of their future;

in There Will Be Time, Havig's group and the Eyrie contend for control of their future;

in "Flight to Forever," the time projector circumnavigates cosmological time.

The Dancer From Atlantis is not a panorama but a single detail in a fifth scenario:

the anakro, a space-time vehicle, passes over Earth's surface or waters while traveling through time;

time expeditions are limited in number;

a malfunctioning vehicle carries three people from historical times back into prehistory and the novel focuses on what they do then.