All players must stand in the teleporter, sending you to Samantha's bedroom. . On the edge of her bed is the Kronorium, which needs to be picked up.
After picking up the book, the player(s) will be teleported back to the map. Arriving back in Kino der Toten, place the Kronorium on the podium, causing it to send one or multiple balls of energy into the projector room.