Coalescent
One thread follows George Poole, an educated and intelligent man in modern day Britain. After his father's sudden death, George has to put his affairs in order, and in the process discovers a previously unknown twin sister sent away to join "The Puissant Order of Holy Mary Queen of Virgins", a secretive (but apparently respectable) sixteen-hundred-year old religious order in Rome. He decides to find out more, and begins to investigate with the help of an old school friend, a member of a "fringe group of outsiders united by new technology" who communicate via the Internet and moderate each other's contributions to keep things ordered -- what a bizarre idea.
At the same time in Rome, Lucia is a fourteen-year old member of the Order who finds herself, unlike her fellow sisters, undergoing some alarming physical changes... puberty.
The other narrative thread follows Regina, a girl born around 400 A.D in Roman Britain. She is spoiled and pampered until her world is shattered by the death of her father and the ending of Roman rule in Britain.
Of the three threads, Regina's story is by far the most vivid and compelling. It is easy to read the broad sweep of history books documenting the decline and fall of the Roman Empire, but what did it mean for the people living through it? Currency, the rule of law, the specialised labour needed to provide metal, and the army to keep the peace... all gone. As one of the characters (Peter, in the "George" thread) says, "It must have been like a nuclear war." No longer enjoying the protection of the Emperor and his armies, the scattered and disorganised British have to fend for themselves against the invading Saxons intent on looting, pillaging and removing all traces of Roman civilisation. Regina must learn how to survive, and eventually her drive and ruthlessness leads her to Rome to confront her past and make a better future for her daughter. Driven by instinct and a desire to protect her family from the barbarian sackings of Rome, she establishes an unusual way of life which threatens to change the meaning of what it is to be human.
There is a great deal more, but it would be unfair to reveal too much and spoil things for others. The dangling threads (the mysterious Kuiper Belt anomaly) and hints (the war 20,000 years hence) leave plenty for future novels in the trilogy to push the story further into big science, big ideas and deep time that Baxter is well known for. Coalescent is scrupulously researched, intriguing, educational and has a genuine effect on the way you see social interactions and communities. Hard to beat, and highly recommended.
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Coalescent is unmistakeably a Stephen Baxter novel, but it's not the sort of novel you expect Stephen Baxter to write. The material is as big and bold as ever - this is a novel concerned with civilisation and society, order and chaos, as viewed through the lens of evolutionary biology - but the focus is more intense than usual. This is a novel about the role of the group and the role of the individual. This is a novel about family. Specifically, the Poole family.
I often find it more interesting when science fiction broadens its horizons into the dynamics of relationships and family, and not just blowing up spaceships.
If you're interested in non-fantasy books (at least books with no orcs and dragons) about post-Roman Britain, look up the Camulod Chronicles books by Jack Whyte. Very well written, and well-researched. I just wish he'd finished them.
By the taping of my glasses, something geeky this way passes
Our intelligent designer has never created an animal that we couldn't improve by strapping a bomb to it.
By the time we figure out how to "enhance" a creature's IQ, we'd have found out how to create an autonomous enough artificial intelligence. Perhaps Baxter was just trying to counterpoint Clarke's HAL. I still find machines (or robots) to be the best substitute for a crewed mission to (put your favorite space exploration destination here).