Solve the riddle

Task notes

• In the study, there is also a clipboard and pen on the desk, and a walkie-talkie is hidden in the fireplace. There is also a Charlie Chaplin hat (and, presumably, a moustache) on a bureau next to the door. Hidden behind the portrait of Lasse on the back wall, there is a printed code: ‘A → E → I → O → U → Æ → Ø → Å’.
• In the lab, there is also a clipboard and pen, the riddle to be solved (written in a coded cypher), a sealed envelope on which are printed instructions that it may not be opened until one of the team members looks like Charlie Chaplin (which contains a copy of the portrait of Lasse hanging in the study), and a walkie-talkie.
• In the unknown room, there is a stylophone and a hollowed-out book, inside of which are puzzle pieces which, when assembled, reveal an image of Lasse’s face. Also, there are four helium balloons tied to the back of the chair. The location of the walkie-talkie in this room is not revealed.
• The riddle’s coded cypher is actually a simple vowel substitution (the key to which is found behind Lasse’s portrait in the study, although it could be easily guessed, as the vowels cycle in alphabetical order), which translates to the following riddle, in Danish:

  What is greater than the Stormester?
  Mark is it.
  And if you eat it, you’ll die?

• The answer to the riddle is ‘nothing’.
• The Faroese-Danish dictionary in the study is a red herring, as the coded riddle bears some resemblance to the Faroese language.