Someone at Channel 4 has clearly got a childlike love of treasure hunts. After Tony Robinson romped around the British Museum in Codex, here we have something on a bigger scale - much bigger. Jamie Theakston has hidden seven secret symbols in seven countries and he's got ten photogenic contestants on the hunt for them. Only a brief taster tape was available but it looks like an agreeable, semiintellectual caper. Whereas in Codex part of the fun was trying to crack the code before the dimwitted contestants did, here it doesn't look like there'll be the same play-along factor. In fact, the whole thing feels less about breaking a "web of cyphers and codes" and more about women in tight clothing climbing rope ladders and running up spiral staircases. Which, for the kind of Da Vinci Code fanbase this is aimed at, can only increase its appeal.