I got this one bundled together with Marion Zimmer Bradley's Seven from the Stars in an Ace double. I did read this one before (in Dutch), but didn't realize that at first. Either version might have been a rewrite, or my memory simply failed me.
Not that it mattered much, as I like to re-read enjoyable books.
It's the first of Keith Laumer's alternate reality stories, featuring 'Blitho P3' , ehm, sorry, 'Blight Insular III'. (I wonder if Ron Hubbard used that name on purpose.)
Old but enjoyable.
Keith Laumer wrote more stories in the same universe:
- Worlds of the Imperium (1962)
- The Other Side of Time (1965)
- Assignment in Nowhere (1968)
- Time Trap (1970)
- Back to the Time Trap (1992)