Agents of Darkness by Caitlin Kiernan.
While I think it fits here, I think it also fits in the s.f. forum. It's a short novel/novella, dense with a splintered view of time. There's an incident in a ranch house on the Salton Sea. The agents sent to investigate are appalled by the results of an outbreak, and one is even infected. A mysterious Brit agent (Immaculata Sexton -- fascinating name) offers some information and the main American agent looks deeper into the case.
Really, that's about the plot. In the meantime, Kiernan alludes to Lovecraft's "The Whisperer in Darkness," Vonnegut's Slaughterhouse 5, a (fictional) movie, the screenplay by Edgar Rice Burroughs and directed by James Whale (Bride of Frankenstein; The Invisible Man), the plot of which has echoes elsewhere in the novel, and even includes aspects of something like one of William Hope Hodgson's short stories, though saying which might be a spoiler. Kiernan's writing, at least in part feels a bit like a slightly softer Laird Barron, and I think reading it along with Barron's work would set off some interesting resonances.
Randy M.