Gems and Diamonds To compensate for the problems the Untouchables are causing him, Catone has planned a big holdup. He calls on the three Gemma brothers, childhood pals who are used to any kind of dirty work, to help him pull off the job. Once more piece is needed, however, to complete his plan: Antonio Catuso, the famous opera singer, who is coming to town to wind in the opera theatre. The huge crowd that comes out to welcome the tenor on his arrival in Cheesecago urges him to demonstrated his famous "high C". As a result of Catuso's powerful voice, ship windows across the city shatter into pieces, setting off the alarm network that the Untouchables have installed in Jack's garage to control Cheesecago's burglaries...