A mash-up of Thompson and Lovecraft should be in my bailiwick, and it is, but this is more pastiche than anything else. His first encounters with sinister figures doing weird things tends to leave both parties puzzled and at cross-purposes, which shiuld be funnier than it actually is, but the gonzo patter and the solemn threats belong on different planets. Later on, politics get involved and that's where it gets properly lively and Thompson incorporates cosmic monstrosities into his worldview of US politics with relative ease and is more at home with plitical figures worshipping or defying Cthulhu than run-of-the-mill high priests and such and his verbal fireworks are more at home with the horror.