Mysterious Castle

You and your friends are traveling through Northern Europe. One day, you notice a medieval castle on a hill and decide to take a closer look. You are greeted by a caretaker who politely invites you on a tour of the castle's dungeons. But suddenly, during the tour, the doors behind you slam shut, the caretaker disappears, and you find yourself trapped. Like in any old castle, there must be a secret passage leading to freedom, but how do you find it? There's no chance of escape unless you know how to communicate with the spirits inhabiting this castle, for they know the answers to all questions...