More like The Sideways Door

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Quest for the FutureNovel
A. E. van Vogtstandalone novel1970
Science fiction and time travel, mysterious in tone, set in contemporary and our world.
DepartureNovel
A. G. Riddlestandalone novel2014
Thriller & suspense, tense in tone, about survival and political intrigue.
“As they begin to piece together the truth, they discover they have the power to change the future and the past--to save our world. or end it.”
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Time Travelers Never DieSeries
series2 books1996
Science fiction and time travel, set in contemporary and our world.
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The Productions of TimeNovel
John Brunnerstandalone novel1967
About identity.
The VisitorsNovel
Clifford D. Simakstandalone novel1980
First contact, about aliens and survival, set in north america.
“WorldCat: Intelligent, alien creatures arrive on Earth from outer space, threatening world stability and presaging the destruction of civilization.”
from the catalogue
The Eternal EnemyNovel
Christopher Pikestandalone novel1993
Tense in tone, about prophecy and survival.
“Soon Rela is regularly recording next week's news, even what is to happen in the far future.”
from the catalogue