Great North Road by Peter F. Hamilton

In Newcastle, AD 2142, Detective Sidney Hurst attends a brutal murder scene. The victim is one of the wealthy North family's clones, but the most disturbing aspect is how he died. Twenty years ago, a North clone billionaire and his household were slaughtered in the exact same manner, on the tropical planet of St Libra. So was Angela Tramelo wrongly convicted back then? She'd never wavered under interrogation - claiming she alone survived an alien…