Recs if you like We Are All Completely Fine...

Speculative (sci-fi, fantasy, horror etc.) novellas less than 200 pages long that are either standalone or read like a standalone story

Horror books with a page count of 200 pages or less.

Before we started defining novellas by word count, they were defined as being any book less than 200 pages. Source: my Analysis of Short Stories & Literature professor in community college. I loved that class. But he loved James Joyce. So, ymmv, I guess.

horrors and thrillers for my wife

Quick speculative fiction reads (quick, like under 40,000 words).

Sterile lights, clipboards, mirrored rooms, lab coats, "for the greater good". You signed the consent form didn't you?

Books that have won the Shirley Jackson Award for outstanding achievement in the literature of horror, the dark fantastic, and psychological suspense.