The Dalkey Archive is a risky read - you risk never reaching for anything that O'Brien wrote again. He did not write that much but still it would be a pity to miss out At Swim-Two-Birds or The Third Policeman. Archive is a spin-off of the latter novel. Coherent, funny at places but it is more of sustained effort than tour-de-force which you have all the rights to expect from O'Brien.
There is little of plot here - two young Irish gentlemen meet by chance a mad scientist and having learned about his plan to annihilate humanity try to stop him from doing so. Characters as different as St Augustine and James Joyce make cameo appearances but they add little to the slim plot. The sad facts of the case are that O'Brien failed to make the expected splash with his first novel, his second wasn't even published and he went on making a brilliant career as a satirical columnist. When twenty years later At Swim-Two-Birds was resurrected and hailed as the first post-modern novel, he tried to go back to writing fiction but with little artistic success. And yet this is a classic so why not give it a chance?