You are P.I. Dan Diamond. You receive an unsigned letter. Inside is an address, and a message: "Please come, you're our only hope". On arrival, you trigger a mechanism, and find yourself falling. Suddenly you are in Franklin's Tomb, and the adventure begins. The screen is split into three different coloured sections. One section gives a description of your surroundings, another lists your possessions and the last is for commands, computer responses and articles to be found as you enter a location.