Emma returns to Basel to interview the restorer of a Blum Box, one of the music boxes manufactured by Victor Blum, Ursula's cousin. Later, she meets with Christina, and together they develop a hypothesis with all the data they have gathered during the investigation. Blum is an audio drama produced by El Extraordinario, created, written, and directed by Carmen Pacheco and Manuel Bartual. This episode stars Charlotte Vega, Joe Manjón, Natalia Tena, Jonathan D. Mellor, Riccardo Rigamonti, Katharina Max-Schackert y Gerald Richli. Sound design by Ignacio Cantisano and Andreu Quesada. Original music by Van Delay. Production by Marina Alonso-Carriazo and Marcus H. Executive production by Marcus H and Marina Alonso-Carriazo. For more information, visit: http://MySwitzerland.com/BLUM