Clans of the Alphane Moon by Philip K. Dick

When CIA agent Chuck Rittersdorf and his psychiatrist wife, Mary, file for divorce, they have no idea that in a few weeks they’ll be shooting it out on Alpha III M2, the distant moon ruled by various psychotics liberated from a mental ward. Nor do they suspect that Chuck’s new employer, the famous TV comedian Bunny Hentman, will also be there aiming his own laser gun. How things came to such a darkly hilarious pass is the subject of Clans of the Alphane Moon, an astutely shrewd and acerbic tale that blurs all conventional distinctions between sanity and madness.