WHAT MAD UNIVERSE?

1987 Grafton paperback, cover artist uncredited.

"Pulp SF magazine editor Keith Winton was answering a letter from a teenage fan when the first moon rocket fell back to Earth and blew him away. 

But where to? Greenville, New York, looked the same, but Gems (Bug-Eyed Monsters) just like the ones on the cover of Startling Stories walked the streets without attracting undue comment. 

And when he brought out a half-dollar coin in a drugstore, the cops wanted to shoot him on sight as an Arcturian spy. 

Wait a minute. Seven-foot purple moon-monsters? Earth at war with Arcturus? General Dwight D. Eisenhower in command of Venus Sector?

What mad universe was this? 

One thing was for sure: Keith Winton had to find out fast - or he'd be good and dead, in this universe of any other."