COALESCENT is the first of a trilogy of novels that does nothing less than tell the story of mankind's possible evolutions and our role in the Universe. Coalescent charts a radical divergence in our evolution; the development of a human hive entity. It is a divergence that has its roots in the dying days of the Roman Empire. The story is told through twin narratives; one takes us through the falling apart of the Roman control of Britain as seen by one girl, the other covers a man's search for a lost sister. A sister who may be living as part of an ancient and secretive order in Rome. Through these diverse personal stories Stephen Baxter charts a story that has terrifying consequences for what we thought was our place in the world, our perceived natural ascendency in the order of things. Things are going to be very different now ...