This description of Lovecraft Country makes me think of, like, 'Supernatural' but trying to be serious and deep.
Which...Well, I was never a big fan of Supernatural being silly and stupid, so that same concept trying to be serious sounds like an absolute slog.
I (re)watched Book of Eli after not seeing it since about the time it came out. A post-apocalyptic action movie from 2010--before that whole genre (d)evolved with The Walking Dead and all other media into an infinite bog-water of zombie-apocalypse stuff. Film's basically as much a Western as it is post-apocalyptic...Mad Max meets High Plains Drifter...Eli, played (wonderfully) by Denzel Washington, is on a Mission From God to go west through apocalypse-America protecting a book (take a guess which)--the last of its kind after copies were burned/lost in the apocalypse. Eli stumbles into a city run by an evil governor (Gary Oldman, also doing a great role) who just so-happens to be looking for that particular book--because it can be used to control people and make them obey.
Hijinks ensue. Some action scenes that hold up, if being a little 'comic book-y'. But it's a good comic book-y.
Twists follow the action scenes that make you either go 'Huh' in wonder or 'huh' in somewhat of disdain, depending on whether you're a stickler for realism. But the 'realism' isn't really the point so much as the story and especially allegory, and the film really succeeds at being a good allegory. There's a bunch of biblical allusion (to the point you'll definitely enjoy it more if your familiar with the Bible--particularly Revelations), and you can kind'a ponder whether the apocalypse wasn't Revelations coming through and you're watching a better-done Left Behind type of thing. There's even a line midway through where Eli is explaining the apocalypse, and his summary was that a war tore a hole in the sky and 'the sun came down' and, uh...Pretty sure there's shades of implication that might/could mean 'the son came down'. But it's never out-and-out stated just as another, much more obvious and physical bit about the setting and what you're seeing is never out-and-out stated--so you get that Blade Runner style ability of questioning both the character and the underpinnings of the story and it's such a fun feeling...
Even pretty minor characters get neat little arcs to them that fit the story and fit the broader theme being shot for, for instance
the governor's second-in-command, who is shown being a pretty stone-cold enforcer for the guy hesitates a few times in the face of Eli surviving shit he shouldn't have survived and the governor's increasingly-maniacal orders. He's still doing this evil shit, but you get the impression he has some remorse, especially when he sees the book the governor wants is The Bible. In the end he is killed, but while he has the chance in his last moments to avenge himself...he instead walks away into the light, takes off his sunglasses/goggles, and dies. It's very...sinner's redemption and penitent thief on the other cross from Jesus type of character arc.
Anyhow, if anyone hasn't seen it would unhesitatingly recommend it--even if the religious metaphor isn't to your interest it's a fun romp on purely action 'pulp Western' grounds with some fun characters (and Gary Oldman chewing scenery).