Lancer (#72-942, first printing) 1965 paperback original. Cover by Richard Powers, 158 pages, 50 cent cover price. Condition is VG+ to near-Fine: tight and square with flat spine; age tanning is mild and uniform; very light overall wear mainly as light rubbing wear to back cover; front cover has a 2" diagonal line at top left [in the black area at top of cover - may not show in scan], and a 1" curved scuff in bottom middle of cover - lost in the artwork [only seen in angled light or detected by rubbing a finger across area - will not show in scan.] "25c" written in pen at top right of first page & page 5 - no other writing, stamps, or marks.

The Mindwarpers, by Eric Frank Russell. [Since I read my copy decades ago, here's the back-cover blurb.]:
WARNING: LOCK YOUR BRAIN
The government's most vital scientific laboratory. No enemy could steal its secrets, because no enemy could possibly get in. But men's minds were another matter. It began with key scientists leaving - just quitting their jobs and drifting away. Then master metalurgist Richard Bransome began to remember a past he had completely forgotten - a past in which he was a cold-blooded murderer. And he set out on a strange, solitary mission to learn the facts - the facts about himself, and the facts about America's most incredible enemy. But how could he do either... when he couldn't even trust his own sanity?