Great Apes by Will Self
After a night of routine debauchery in London's clubland, the artist Simon Dykes falls asleep - only to wake up to find his girlfriend has been transmogrified into a chimp. Indeed the whole of London, though functioning normally, is run and inhabited by chimps. Can the great chimp-doctor, Zack Busner, cure him of his illusion that he's human? A wonderfully funny and clever novel that manages too to evoke great feelings of pity and sadness in the reader, this is in effect a meditation on how we treat animals.