The Time Quake — Linda Buckley-Archer

Time itself is splintering. If the catastrophic consequences of time travel are now impossible to ignore, Lord Luxon only has eyes for its awesome possibilities. He has his sights set on no lesser prize than America. Abducted to 1763, Peter and Kate begin to understand that history has arrived at its tipping point. Adrift in time, Kate transforms into an oracle, able to see the future as easily as the past. While Gideon does all he can to help, he is tormented by the knowledge that The Tar Man, his nemesis, is also his own brother. As they pursue him through the dark streets of eighteenth-century London, and the time quakes begin, Peter realises that this monster may hold the fate of all of us in his hands.