At this point I don't know if you will understand the hint but here it is. You have to do something in Sunflower City. Check for different signs you will understand. Then play Shepherd's Residence again.
Sorry but could you please elaborate a bit more? The only signs I noticed in Sunflower City after the latest update was the Booth poster near special storage, and about the missing girl while doing murder investigation poster. You were mentioned "switcher", what kind of switcher? Is it light switcher?