sees a solo challenge as each contestant has to use a series of Quipu devices to decipher names of locations in Machu Picchu, which they must navigate to using their maps. This problem is compounded by low visibility and drizzle common to the Yungas, making Simon demoralised. Saskia's skills in decryption see her solve the puzzles quickly, leading her first to the second quipu. However, on the third quipu, despite reaching it first, she wastes time going through all 25 shift codes instead of simply using a reverse substitution cipher, which Marianne does first to reveal "Young Peak". Meanwhile, Adrian and Simon have both been placed into the poison chalice round by solving the clues too slowly. With a slight lead of Saskia, Marianne sets off up Young Peak, a mountain next to Machu Picchu. However, she fails to notice her clue on the ground, a cryptic map resembling a hedgehog. Saskia finds it, and at the summit notices structure formations similar to the diagram. Once again, Saskia there finds the symbol, ensuring her a place in the final, leaving Marianne visibly upset that she didn't even get a fair shot at winning. In the poison chalice round, Mairianne and Simon trade the chalice several times before it is passed to Adrian, who is eliminated. Episode Seven (finale): England and Scotland with a Tudor Theme First aired 24 February 2007, Channel 4. With the show reaching its climax, the team return home to Great Britain, working individually to find the £50,000 prize money. Each contestant is allowed to have a previously eliminated player aid them in their final quest. Saskia chooses philosopher Nat, with Mairianne opting for codebreaking enthusiast Suzie, and Simon sticking with his old comrade Adrian. The first clue is at the National Portrait Gallery in London, where the teams must find a specific painting with an inscription. They must then enter the exhibit code into the audio tour guide, to hear Jamie's voice telling them where to go next, Hatfield House. It is Adrian who finds the words first, written faintly on a portrait of James I. He and Simon head off, though both Saskia and Mairianne are not far behind. At Hatfield House, Elizabeth I's childhood home, the team find a clue about the heir revealing itself. They then find a large hall with numerous mirrors. Adrian, in train of thought, actually says the answer, that