Hell is Other People by David-Jack Fletcher

Between the black market organ trading, sentient rain, and cannibal romance, this collection delivers ten gory horror tales. The collection is split into three sections and grapples with how other people can fail us through lies, deceit, and possession. The ways that other people are incomparable in their cruelty. The ways they can lead us to our deaths. This collection, featuring reworked versions of previously published short stories and original material, amalgamates David-Jack Fletcher’s writing journey. It explores the primary theme that people, not demons, monsters, or ancient worm gods, are the cause of evil—the arbiters of our impending doom. 

The monsters, well, they’re just a happy coincidence.