What is the main conflict in The Third Policeman by Flann O'Brien?

The unnamed narrator of The Third Policeman is obsessed with the bizarre philosopher de Selby, and in order to publish a book about de Selby, the narrator agrees to murder a man for his money. However, the narrator's partner in turn murders the narrator, who is thrust into a bizarre journey through the afterlife. The narrator tries to piece together what is happening and finally finds his way home, where he discovers that he's been murdered and must start his hellish journey over again.