At Flag Fen near Peterborough he discovers a vast ancient causeway built across the fens, with sacred objects placed among its timbers. At Maiden Castle's hill fort in Dorset he unearths evidence of macabre human sacrifices to ward off evil spirits. Neil travels to Anglesey, where swords, precious artifacts and even a slave chain were ritually deposited. It was home of the druids. Neil learns about their bizarre rituals and dark reputation and how the Romans viewed them as dangerous religious extremists.
—Enzedder