Spy Fiction

After graduation from the Time Patrol Academy in the American West of the Oligocene period:

"...each went back to the same year he had come from: the same hour."
-Poul Anderson, "Time Patrol" IN Anderson, Time Patrol (New York, 2006), 2, p. 16.

Ostensibly, there has been no interruption to their lives. In reality, each:

has been physically and psychologically trained;
has gained an outline of history, both past and future, and also a more detailed knowledge of his own period;
now belongs to a powerful secret organization -

Everard "...got a list of contemporary agents (several of them holding jobs in places like military intelligence)..." (ibid.)

Thus, Everard, ostensibly a "special consultant to Engineering Studies Co..." (p. 16), has access to top secret information. His fellow Patrolmen who are intelligence agents will, in the 1950s, be on both sides of the Iron Curtain and will cooperate to keep history on track. The Cuban missile crisis must happen on schedule but must not result in World War III.

Here we have scope for a spy novel in which a CIA agent engaged in espionage against the USSR:

cooperates with his colleagues;
most of the time, works against his opposite numbers in the KGB, GRU etc;
occasionally, and very covertly, shares military intelligence with some of his overt opponents;
also unaccountably shares such information with one Everard, a civilian working with "Engineering Studies" -

- but the fact that this was all connected with time travel would not be mentioned. To learn more, the reader would have to follow the further adventures of Everard in Time Patrol and The Shield Of Time.