Carl and Hamilton investigate an extraordinary collection of Celtic gold from the Iberian Peninsula that dates back thousands of years. Amongst the rare artefacts are a gold bowl worth over £1m, fine pieces of jewellery depicting the goddess Astarte, and a stone altar to the god Endovelicus which might have been used in rituals that involved blood sacrifice.

In Hamilton's possession is a wooden chest stuffed full of relics from medieval Christian pilgrimages. These include clamshell pendants from the Camino de Santiago in Spain and Jerusalem crosses from the Holy Land. In addition, Hamilton has two stone carvings. One is of a pilgrim clad in a cloak and carrying a book and staff; the other is very similar except that he is carrying a spear.