John is infinite. He can become any book, any combination of words – every thought, act and expression that has ever been, or ever will be, written. Now 800 years old, John wants to tell his story. Looking back over his life, from its beginnings with a medieval anchoress to his current lodgings beside the deathbed of a Cold War spy, John pieces together his tale: the love that held him together and, in particular, the reasons for a murder that took place in Moscow fifty years earlier, which set in train a shattering series of events.