Dr. Alice Roberts travels back to the ages of Bronze and Iron to discover what kind of a place Britain was before the Romans invaded. With no written history, only archaeology can provide the clues. She uncovers a world that is complex, sophisticated-and a little strange. She examines the two Hebridean Bronze Age skeletons known as the Cladh Hallan Mummies: not only do they appear to have been mummified, new analysis has revealed they are made up of a jigsaw of different people. Then, in Norfolk, she gets her hands dirty helping pull up timber from a huge prehistoric monument that has been hidden in the mud for at least 2,000 years.