More like Operation Time Search

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The Lincoln HuntersNovel
Wilson Tuckerstandalone novel1958
Set in north america.
The Door Into SummerNovel
Robert A. Heinleinstandalone novel1957
About revenge and robots, set in north america and near future.
The Dancer from AtlantisNovel
Poul Andersonstandalone novel1971
Set in ancient world and mediterranean.
Time TradersSeries
series7 books1958
Set in other star systems.
“Norton, later joined by collaborators Sherwood Smith and P. M. Griffin, expanded the sequence to seven novels published between 1958 and 2002, and revised the opening book herself in 2000.”
from the catalogue
Start with The Time Traders →
The Puppet MastersNovel
Robert A. Heinleinstandalone novel1951
Alien invasion, tense in tone, about aliens and survival.
“Parasitical aliens attach themselves to human hosts and take over their bodies.”
from the catalogue
Time Travelers Never DieSeries
series2 books1996
Set in contemporary.
Start with Time Travelers Never Die →