Once home, explain to Mattie that Lillian has taken away your pass and won't allow visitors on the set anymore. Mattie will be a total genius and suggest you get hired as an extra on the set via her agent, Dwayne Powers. There's really nothing to do for an extra on the set. They'll just need you to be ready and on hand at a moment's notice, so that means you'll have enough time to work on solving the mystery.
Follow the address that Mattie gave you and hail a cab. When you go to the agency, remember to ring the buzzer twice before Dwayne actually lets you in. Mattie has already mentioned that you'll be arriving so you don't have to worry about a thing. He'll immediately hire you, seeing that you and Mattie are friends. You can talk to him if you want to. Apparently, he supplies nearly all the talents of World Wide Broadcasting, even Rick Arlen before they came to a bitter parting. You'll see the hatred he has for Rick based on the world that he used, like a ladder climber and a good for nothing who thinks that acting is about charm and not about talent. After your conversation, Powers will now confirm your being hired as the extra for the set. Talk about instant fame!
Now go back to the studio and talk to the guard again. Since you're not using a visitor's pass anymore, you'll need to sign in again to get your ID. Once that's done get straight to Millie's Prop Room. The only way she'll let you in is if you answer a riddle for her. Here's where the distinction of the level of difficulty pops up. Each level provides a different riddle so here's the riddle and the respective answer per riddle, for each level starting from the Junior Detective going up.
Junior
Soft as a petal that falls from a tree, the more I dry, the wetter I'll be!: towel
I run all day and never walk. I tell you something but I do not talk.: clock
When you look at my face it's easy to see, you're looking at you when you're looking at me.:mirror
Senior:
Give it air and it will live . Give it water and it will die. : fire
What has a head and tail but no body?: coin
What has teeth but can't eat?: comb
Master:
The more you make the more you leave behind?: footprints
What is full if holes but holds water?: sponge
What has four fingers and one thumb but is not alive?: glove
Solving the riddle earns Millie's respect and subsequently, the chance to explore the Prop Room alone as she will go and unpowder her nose.
Once you're in the Prop Room, turn around to see a bell with an inscription that says: The key to a mystery is revealed by the wise; when the bell sounds its toll and the moon makes its rise."
Cryptic. I wonder what it means? To the right of that are shelves with items you can look at such as the jewelry box, gramophone and a radio. Around the room there are various instruments such as the harp and the piano. When you check the sheet music, you'll see that there are some colored notes. If you translates that to the letter representatives, you will see the words: Cage a bag egg, ace.