Nigel is looking forward to giving a civilized guest lecture in Paris with Sydney, when her fear of boredom is resolved: MI5 agent David Watson commandeers her to help prevent a top-secret assassination at a peace conference. She is believed to be mentioned in a Nostradamus prediction as the 'fox' to stop the crime. The key seems to be the missing '1600' medallion, presumably buried with the seer in a church. They are countered by rival relic hunter Antonio Castillo and a mystery killer, while tracking down the medallion to the monastery of its presumed thief, the discredited Cardinal Dallier. His journal, which they steal back, leads to the '1600', but the clock ticks toward the royal assassination and the mastermind strikes.
—KGF Vissers