More Stately Mansions — John B. Rosenman

Captain Temple leads a mission to K22 and finds a beautiful planet with magnificent shining cities. It appears to be a lucrative new market for the Merchants Guild.

There's just one problem: the cities are mysteriously empty. He can't find even one survivor, which means the planet is off-limits to commercial exploitation and cannot be used to achieve financial profits in any way.

Soon Temple discovers an even greater problem, one that is strange and ominous and threatens his crew's very survival.
Not only that, it is an incredible cosmic mind-stretcher that strains sanity to the breaking point, not just the characters' sanity but the readers' as well.