I ran Wyvern's Roost last week. It's a very efficient and effective location you can drop into a campaign and easily fits as an island on a single lake or sea hex. The players have a great deal of latitude in how they approach the situation. The maps and visuals support the players taking a 3-dimensional approach to the tower. Plenty of elements are present to interact with in such a small location. My players completely surprised me and it was easy to determine the result. Perfect for a single episode within a campaign!