Starman Plays Leisure Suit Larry: Wet Dreams Dry Twice - Part 13 (NSFW)

In which an encounter with a senile super spy yields the third keystone, before we go off on a search for the lost grave of Lady Gobbledick. Which will become even more lost after Larry discovers it. Also, I show how to solve the most annoying puzzle in the game, though I'm not quite sure how you're supposed to solve it beyond random guessing!